/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg-primary:#FFFFFF;
  --bg-section:#F8F9FA;
  --bg-card:#FFFFFF;
  --bg-elevated:#F1F3F5;
  --border:#E5E8EB;
  --nav-bg:#FFFFFF;
  --text-primary:#191F28;
  --text-secondary:#4E5968;
  --text-muted:#8B95A1;
  --text-dim:#ADB5BD;
  --accent-blue:#3182F6;
  --accent-purple:#4A5BFF;
  --accent-green:#34C759;
  --accent-amber:#FF9500;
  --accent-red:#FF3B30;
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:16px;
  --radius-xl:20px;
  --transition:0.3s cubic-bezier(0.16,1,0.3,1)
}
html{scroll-behavior:smooth}
body{font-family:'Pretendard Variable','Pretendard',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
.container{max-width:960px;margin:0 auto;padding:0 24px}
::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:#F8F9FA}::-webkit-scrollbar-thumb{background:#CED4DA;border-radius:3px}

/* ===== Animations ===== */
@keyframes fadeInUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes blink{0%,100%{opacity:1}50%{opacity:0}}
@keyframes waveMove{
  0%{background-position-x:0}
  50%{background-position-x:50%}
  100%{background-position-x:100%}
}
@keyframes hueShift{0%{filter:hue-rotate(0deg)}100%{filter:hue-rotate(40deg)}}
.animate-in{animation:fadeInUp 0.6s ease both}

/* ===== Navigation ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;padding:16px 0;transition:all .3s ease;background:var(--nav-bg);box-shadow:0 2px 8px rgba(0,0,0,0.06)}
.nav.scrolled{background:var(--nav-bg);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);padding:12px 0;box-shadow:0 4px 12px rgba(0,0,0,0.08)}
.nav-inner{max-width:960px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between}
.nav-logo{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--text-primary)}
.logo-icon{font-size:24px}.logo-text{font-size:20px;font-weight:800;letter-spacing:-.5px;color:var(--text-primary)}
.nav-links{display:flex;gap:28px}
.nav-links a{color:var(--text-secondary);text-decoration:none;font-size:14px;font-weight:600;transition:color var(--transition)}
.nav-links a:hover{color:var(--text-primary)}
.nav-auth{display:flex;gap:8px;align-items:center}
.nav-cta{background:var(--accent-blue);color:#fff;border:none;padding:8px 20px;border-radius:20px;font-size:13px;font-weight:700;cursor:pointer;transition:all var(--transition);font-family:inherit}
.nav-cta:hover{background:#1B6DE8;transform:translateY(-1px)}
.nav-cta-register{background:transparent;border:1px solid var(--accent-blue);color:var(--accent-blue);border-radius:20px}
.nav-cta-register:hover{background:rgba(49,130,246,0.08);transform:translateY(-1px)}
.nav-cta-logout{background:var(--bg-elevated);color:var(--text-secondary);border:1px solid var(--border);padding:6px 16px;font-size:12px;border-radius:20px}
.nav-cta-logout:hover{background:var(--border);color:var(--text-primary);transform:translateY(-1px)}
.nav-user{display:flex;align-items:center;gap:12px}
.nav-user-name{font-size:14px;font-weight:700;color:var(--text-primary);white-space:nowrap}

/* ===== Hero ===== */
.hero{min-height:100vh;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;padding:120px 24px 80px;background:linear-gradient(135deg,#1B1D6A 0%,#3182F6 100%)}
.hero::after{
  content:'';
  position:absolute;
  bottom:-1px;
  left:0;
  right:0;
  height:80px;
  z-index:4;
  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 100' preserveAspectRatio='none'%3E%3Cpath fill='%23ffffff' d='M0,40 C240,90 480,0 720,50 C960,100 1200,20 1440,60 L1440,100 L0,100 Z'/%3E%3C/svg%3E") repeat-x;
  background-size:1440px 100%;
  animation:waveMove 8s ease-in-out infinite;
}
.particle-canvas{display:none}
.hero-bg-effects{position:absolute;inset:0;pointer-events:none;z-index:0}
.mesh-blob{display:none}
.mesh-1{display:none}
.mesh-2{display:none}
.mesh-3{display:none}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);background-size:60px 60px;mask-image:radial-gradient(ellipse 60% 50% at 50% 50%,black 20%,transparent 70%);-webkit-mask-image:radial-gradient(ellipse 60% 50% at 50% 50%,black 20%,transparent 70%)}
.hero-scroll-overlay{position:absolute;inset:0;background:#FFFFFF;opacity:0;z-index:2;pointer-events:none;transition:opacity .1s linear}
.hero-content{text-align:center;position:relative;z-index:3;max-width:640px}
.hero-badge{display:inline-block;padding:8px 20px;border-radius:24px;background:rgba(255,255,255,0.15);border:1px solid rgba(255,255,255,0.25);font-size:13px;font-weight:600;color:#fff;margin-bottom:28px;animation:fadeInUp .8s ease;backdrop-filter:blur(4px)}
.hero-title{font-size:clamp(32px,6vw,52px);font-weight:900;letter-spacing:-2px;line-height:1.15;margin-bottom:20px;min-height:1.15em;color:#fff}
.hero-accent{background:none;-webkit-background-clip:unset;-webkit-text-fill-color:#fff;background-clip:unset;color:#fff;opacity:.9}
.typing-cursor{animation:blink .8s infinite;font-weight:300;-webkit-text-fill-color:#fff;color:#fff}
.hero-desc{font-size:17px;color:rgba(255,255,255,0.8);line-height:1.7;margin-bottom:36px}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:48px}
.btn-primary{background:#fff;color:#1B1D6A;border:none;padding:14px 32px;border-radius:var(--radius-md);font-size:16px;font-weight:700;cursor:pointer;transition:all var(--transition);box-shadow:0 4px 24px rgba(0,0,0,0.15);font-family:inherit}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 32px rgba(0,0,0,0.2)}
.btn-secondary{background:transparent;color:#fff;border:1px solid rgba(255,255,255,0.5);padding:14px 32px;border-radius:var(--radius-md);font-size:16px;font-weight:700;cursor:pointer;transition:all var(--transition);font-family:inherit}
.btn-secondary:hover{background:rgba(255,255,255,0.1);color:#fff;border-color:rgba(255,255,255,0.8)}
.hero-stats{display:flex;align-items:center;justify-content:center;gap:32px}
.hero-stat{text-align:center}.hero-stat-num{font-size:28px;font-weight:900;color:#fff;letter-spacing:-1px}
.hero-stat-label{font-size:12px;color:rgba(255,255,255,0.7);font-weight:600;margin-top:4px}
.hero-stat-divider{width:1px;height:36px;background:rgba(255,255,255,0.25)}

/* ===== Daily Quote ===== */
.daily-quote-section{background:linear-gradient(135deg,rgba(49,130,246,.06),rgba(74,91,255,.06));border-top:1px solid var(--border);border-bottom:1px solid var(--border);padding:18px 0}
.daily-quote-inner{text-align:center}
.daily-quote-text{font-size:15px;font-weight:600;color:var(--text-secondary);font-style:italic;margin-bottom:4px}
.daily-quote-author{font-size:12px;font-weight:700;color:var(--text-muted)}

/* ===== Section Common ===== */
.section{padding:80px 0}
.section:nth-child(even){background:var(--bg-section)}
.section:nth-child(odd){background:var(--bg-primary)}
.section-header{text-align:center;margin-bottom:48px}
.section-badge{display:inline-block;padding:6px 16px;border-radius:20px;background:rgba(49,130,246,.08);border:1px solid rgba(49,130,246,.15);font-size:13px;font-weight:600;color:var(--accent-blue);margin-bottom:16px}
.section-title{font-size:clamp(24px,4vw,36px);font-weight:900;letter-spacing:-1px;margin-bottom:8px;color:var(--text-primary)}
.section-desc{font-size:15px;color:var(--text-muted)}

/* ===== Sector Cards ===== */
.sectors-list{display:flex;flex-direction:column;gap:16px}
.sector-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);overflow:hidden;transition:all .4s cubic-bezier(.16,1,.3,1);cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,0.08)}
.sector-card:hover{box-shadow:0 4px 16px rgba(0,0,0,0.12);transform:translateY(-2px)}
.sector-card.open{border-color:color-mix(in srgb,var(--sector-color) 40%,transparent)}
.sector-header{display:flex;align-items:center;gap:16px;padding:24px 28px;user-select:none}
.sector-icon-box{width:56px;height:56px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:28px;flex-shrink:0;background:var(--bg-section)}
.sector-info{flex:1;min-width:0}.sector-name{font-size:20px;font-weight:800;letter-spacing:-.5px;color:var(--text-primary)}
.sector-count{font-size:13px;color:var(--text-muted);font-weight:600;margin-top:2px}
.sector-toggle{width:32px;height:32px;border-radius:8px;background:var(--bg-elevated);display:flex;align-items:center;justify-content:center;font-size:14px;color:var(--text-muted);transition:all var(--transition);flex-shrink:0}
.sector-card.open .sector-toggle{transform:rotate(180deg)}
.sector-body{max-height:0;overflow:hidden;transition:max-height .4s cubic-bezier(.16,1,.3,1)}
.sector-card.open .sector-body{max-height:300px}
.sector-tags{display:flex;flex-wrap:wrap;gap:10px;padding:0 28px 24px}
.cert-tag{padding:8px 18px;border-radius:24px;font-size:14px;font-weight:700;border:1px solid;transition:all var(--transition);cursor:pointer;background:var(--bg-section)}
.cert-tag:hover{transform:translateY(-2px);filter:brightness(0.95)}

/* ===== Always Exam Box ===== */
.always-exam-box{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:24px 28px;margin-bottom:28px;box-shadow:0 2px 8px rgba(0,0,0,0.08)}
.always-exam-header{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.always-exam-icon{font-size:20px}.always-exam-title{font-size:17px;font-weight:800;letter-spacing:-.3px;color:var(--text-primary)}
.always-exam-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px}
.always-exam-item{display:flex;align-items:center;gap:12px;padding:10px 14px;background:var(--bg-elevated);border-radius:var(--radius-sm);border:1px solid var(--border)}
.always-exam-name{font-size:13px;font-weight:800;color:var(--text-primary);white-space:nowrap;min-width:100px}
.always-exam-desc{font-size:12px;color:var(--text-muted);font-weight:600}

/* ===== Calendar ===== */
.calendar-filters{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:20px}
.cal-filter-btn{padding:6px 16px;border-radius:20px;border:1px solid var(--border);background:var(--bg-card);color:var(--text-muted);font-size:13px;font-weight:700;cursor:pointer;transition:all var(--transition);font-family:inherit}
.cal-filter-btn:hover{border-color:#CED4DA;color:var(--text-secondary)}
.cal-filter-btn.active{border-color:var(--accent-blue);background:rgba(49,130,246,.08);color:var(--accent-blue)}
.calendar-legend{display:flex;justify-content:center;gap:20px;margin-bottom:24px;flex-wrap:wrap}
.legend-item{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text-muted);font-weight:600}
.legend-dot{width:10px;height:10px;border-radius:50%;display:inline-block}
.calendar-wrapper{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:28px;box-shadow:0 2px 8px rgba(0,0,0,0.08)}
.calendar-nav{display:flex;align-items:center;justify-content:center;gap:24px;margin-bottom:24px}
.cal-nav-btn{width:36px;height:36px;border-radius:10px;border:1px solid var(--border);background:var(--bg-elevated);color:var(--text-secondary);font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition);font-family:inherit}
.cal-nav-btn:hover{background:var(--border);color:var(--text-primary)}
.cal-month-title{font-size:20px;font-weight:800;letter-spacing:-.5px;min-width:160px;text-align:center;color:var(--text-primary)}
.calendar-day-headers{display:grid;grid-template-columns:repeat(7,1fr);margin-bottom:8px}
.calendar-day-headers span{text-align:center;font-size:12px;color:var(--text-dim);font-weight:700;padding:8px 0}
.calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:4px}
.cal-cell{position:relative;min-height:52px;border-radius:var(--radius-sm);padding:4px;display:flex;flex-direction:column;align-items:center;transition:background .2s ease}
.cal-cell:hover{background:var(--bg-elevated)}.cal-cell.has-events{cursor:pointer}
.cal-day-num{font-size:13px;font-weight:600;color:var(--text-muted);margin-bottom:4px}
.cal-cell.today .cal-day-num{color:var(--accent-blue);font-weight:900;background:rgba(49,130,246,.1);width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center}
.cal-dots{display:flex;gap:3px;flex-wrap:wrap;justify-content:center;max-width:100%}
.cal-dot{width:7px;height:7px;border-radius:50%;flex-shrink:0}
.cal-tooltip{position:fixed;z-index:200;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:12px 16px;display:none;pointer-events:none;max-width:320px;box-shadow:0 8px 32px rgba(0,0,0,0.12)}
.tooltip-event{display:flex;align-items:center;gap:8px;padding:3px 0;font-size:12px;font-weight:600;color:var(--text-secondary)}
.tooltip-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}
.tooltip-cert{color:var(--text-primary);font-weight:700}
.tooltip-date{color:var(--text-dim);font-size:11px;margin-left:auto}

/* ===== Upcoming Events ===== */
.upcoming-section{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:24px 28px;margin-top:24px;box-shadow:0 2px 8px rgba(0,0,0,0.08)}
.upcoming-header{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.upcoming-icon{font-size:20px}.upcoming-title{font-size:17px;font-weight:800;letter-spacing:-.3px;color:var(--text-primary)}
.upcoming-list{display:flex;flex-direction:column;gap:8px}
.upcoming-item{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--bg-elevated);border-radius:var(--radius-sm);border:1px solid var(--border);transition:all var(--transition)}
.upcoming-item:hover{border-color:#CED4DA;box-shadow:0 2px 8px rgba(0,0,0,0.06)}
.upcoming-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}
.upcoming-label{font-size:14px;font-weight:700;color:var(--text-primary);flex:1}
.upcoming-date{font-size:12px;font-weight:700;color:var(--text-muted);white-space:nowrap}
.upcoming-dday{font-size:11px;font-weight:800;padding:3px 10px;border-radius:12px;white-space:nowrap}
.upcoming-dday.soon{background:rgba(255,59,48,.1);color:var(--accent-red)}
.upcoming-dday.normal{background:rgba(49,130,246,.1);color:var(--accent-blue)}
.upcoming-empty{text-align:center;padding:20px;color:var(--text-dim);font-size:14px}

/* ===== Cal Day Modal ===== */
.cal-day-modal-card{max-width:420px;padding:28px}
.cal-day-event-item{display:flex;align-items:center;gap:12px;padding:14px 16px;background:var(--bg-elevated);border-radius:var(--radius-sm);margin-bottom:8px;border-left:3px solid}
.cal-day-event-label{font-size:15px;font-weight:700;color:var(--text-primary)}
.cal-day-event-date{font-size:12px;color:var(--text-muted);font-weight:600;margin-top:2px}
.cal-day-event-type{font-size:11px;font-weight:800;padding:2px 10px;border-radius:10px;margin-left:auto;white-space:nowrap}

/* ===== Cert Detail Modal ===== */
.cert-detail-modal-card{max-width:640px;padding:32px;max-height:85vh;overflow-y:auto}
.cert-detail-section{margin-bottom:24px}.cert-detail-section:last-child{margin-bottom:0}
.cert-section-title{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:800;color:var(--text-primary);margin-bottom:12px;padding-bottom:8px;border-bottom:1px solid var(--border)}
.cert-info-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.cert-info-item{padding:10px 14px;background:var(--bg-elevated);border-radius:var(--radius-sm)}
.cert-info-item.full-width{grid-column:1/-1}
.cert-info-label{font-size:11px;font-weight:700;color:var(--text-dim);margin-bottom:3px;text-transform:uppercase;letter-spacing:.3px}
.cert-info-value{font-size:14px;font-weight:700;color:var(--text-secondary);line-height:1.5}
.cert-study-tip{padding:14px 16px;background:var(--bg-elevated);border-radius:var(--radius-sm);font-size:14px;color:var(--text-secondary);line-height:1.7;border-left:3px solid var(--accent-purple)}
.cert-daily-box{padding:14px 16px;background:rgba(49,130,246,.06);border:1px solid rgba(49,130,246,.15);border-radius:var(--radius-sm);font-size:15px;font-weight:700;color:var(--accent-blue);text-align:center}
.cert-placeholder{text-align:center;padding:40px 20px;color:var(--text-dim)}
.cert-placeholder-icon{font-size:48px;margin-bottom:12px;opacity:.5}
.cert-placeholder p{font-size:15px;line-height:1.6}

/* ===== Checkin Area ===== */
.checkin-area{padding:20px;background:var(--bg-elevated);border-radius:var(--radius-md)}
.checkin-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;flex-wrap:wrap;gap:12px}
.checkin-btn{padding:10px 24px;border-radius:var(--radius-md);border:none;font-size:14px;font-weight:800;cursor:pointer;font-family:inherit;transition:all var(--transition)}
.checkin-btn.not-checked{background:linear-gradient(135deg,#34C759,#30D158);color:#fff;box-shadow:0 4px 16px rgba(52,199,89,0.25)}
.checkin-btn.not-checked:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(52,199,89,0.35)}
.checkin-btn.checked{background:var(--bg-card);color:var(--text-muted);border:1px solid var(--border);cursor:default}
.checkin-streak{font-size:14px;font-weight:800;color:var(--accent-amber)}
.checkin-streak-num{font-size:20px}
.mini-cal{margin-top:12px}
.mini-cal-header{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:8px}
.mini-cal-title{font-size:13px;font-weight:700;color:var(--text-secondary);min-width:90px;text-align:center}
.mini-cal-nav{background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:14px;padding:4px 8px;border-radius:6px;transition:all var(--transition)}
.mini-cal-nav:hover{background:var(--bg-card);color:var(--text-primary)}
.mini-cal-days{display:grid;grid-template-columns:repeat(7,1fr);gap:2px}
.mini-cal-day-header{text-align:center;font-size:10px;color:var(--text-dim);font-weight:700;padding:4px 0}
.mini-cal-day{text-align:center;font-size:11px;font-weight:600;color:var(--text-dim);padding:4px 0;border-radius:4px}
.mini-cal-day.current-month{color:var(--text-muted)}
.mini-cal-day.checked-day{background:rgba(52,199,89,.15);color:var(--accent-green);font-weight:800}
.mini-cal-day.today-day{border:1px solid var(--accent-blue);color:var(--accent-blue)}

/* ===== Ranking ===== */
.ranking-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:28px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,0.08)}
.ranking-list{display:flex;flex-direction:column;gap:8px;margin-bottom:20px}
.ranking-item{display:flex;align-items:center;gap:14px;padding:14px 18px;background:var(--bg-elevated);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition);border:1px solid transparent}
.ranking-item:hover{border-color:var(--border);transform:translateY(-1px);box-shadow:0 2px 8px rgba(0,0,0,0.06)}
.ranking-item.top-1{background:linear-gradient(135deg,rgba(255,215,0,.08),rgba(255,215,0,.02));border-color:rgba(255,215,0,.2)}
.ranking-item.top-2{background:linear-gradient(135deg,rgba(192,192,192,.1),rgba(192,192,192,.03));border-color:rgba(192,192,192,.25)}
.ranking-item.top-3{background:linear-gradient(135deg,rgba(205,127,50,.08),rgba(205,127,50,.02));border-color:rgba(205,127,50,.2)}
.ranking-rank{font-size:20px;font-weight:900;min-width:32px;text-align:center;color:var(--text-primary)}
.ranking-info{flex:1;min-width:0}
.ranking-nickname{font-size:14px;font-weight:800;color:var(--text-primary);display:flex;align-items:center;gap:6px}
.ranking-active-dot{width:8px;height:8px;border-radius:50%;background:var(--accent-green);flex-shrink:0}
.ranking-stats{display:flex;gap:12px;margin-top:2px}
.ranking-stat{font-size:12px;font-weight:700;color:var(--text-muted)}
.ranking-stat strong{color:var(--text-secondary)}
.ranking-empty{text-align:center;padding:40px;color:var(--text-dim);font-size:14px}
.ranking-actions{text-align:center}
.share-card-btn{padding:12px 28px;border-radius:var(--radius-md);border:1px solid var(--border);background:var(--bg-card);color:var(--text-secondary);font-size:14px;font-weight:700;cursor:pointer;font-family:inherit;transition:all var(--transition)}
.share-card-btn:hover{border-color:#CED4DA;color:var(--text-primary);transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,0.08)}

/* ===== Ranker Modal ===== */
.ranker-modal-card{max-width:380px;padding:28px}
.ranker-certs{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.ranker-cert-tag{padding:6px 14px;border-radius:16px;font-size:13px;font-weight:700;background:rgba(49,130,246,.08);color:var(--accent-blue);border:1px solid rgba(49,130,246,.15)}

/* ===== Community ===== */
.community-tabs{display:flex;gap:8px;justify-content:center;margin-bottom:20px;flex-wrap:wrap}
.comm-tab{padding:10px 20px;border-radius:24px;border:1px solid var(--border);background:var(--bg-card);color:var(--text-muted);font-size:13px;font-weight:700;cursor:pointer;transition:all var(--transition);font-family:inherit}
.comm-tab:hover{border-color:#CED4DA;color:var(--text-secondary)}
.comm-tab.active{background:var(--accent-blue);border-color:var(--accent-blue);color:#fff}
.tips-filter,.study-filter{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-bottom:16px}
.tips-filter-btn,.study-filter-btn{padding:4px 12px;border-radius:16px;border:1px solid var(--border);background:var(--bg-card);color:var(--text-dim);font-size:12px;font-weight:700;cursor:pointer;transition:all var(--transition);font-family:inherit}
.tips-filter-btn:hover,.study-filter-btn:hover{border-color:#CED4DA;color:var(--text-secondary)}
.tips-filter-btn.active{border-color:var(--accent-purple);background:rgba(74,91,255,.08);color:var(--accent-purple)}
.study-filter-btn.active{border-color:var(--accent-green);background:rgba(52,199,89,.08);color:var(--accent-green)}
.community-actions{display:flex;justify-content:flex-end;margin-bottom:16px}
.write-btn{padding:10px 24px;border-radius:var(--radius-md);border:none;background:var(--accent-blue);color:#fff;font-size:14px;font-weight:700;cursor:pointer;transition:all var(--transition);font-family:inherit;box-shadow:0 4px 16px rgba(49,130,246,.2)}
.write-btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(49,130,246,.3);background:#1B6DE8}
.posts-list{display:flex;flex-direction:column;gap:12px}
.post-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 24px;cursor:pointer;transition:all var(--transition);box-shadow:0 2px 8px rgba(0,0,0,0.04)}
.post-card:hover{border-color:#CED4DA;transform:translateY(-2px);box-shadow:0 4px 16px rgba(0,0,0,0.08)}
.post-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.post-nickname{font-size:13px;font-weight:700;color:var(--text-secondary)}
.post-time{font-size:12px;color:var(--text-dim);font-weight:600}
.post-title-text{font-size:16px;font-weight:800;letter-spacing:-.3px;margin-bottom:6px;line-height:1.4;color:var(--text-primary)}
.post-preview{font-size:14px;color:var(--text-muted);line-height:1.6;margin-bottom:12px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.post-tags{display:flex;gap:6px;margin-bottom:12px;flex-wrap:wrap}
.post-tag{padding:3px 10px;border-radius:12px;font-size:11px;font-weight:700}
.post-tag.company{background:rgba(49,130,246,.08);color:var(--accent-blue)}
.post-tag.position{background:rgba(74,91,255,.08);color:var(--accent-purple)}
.post-tag.cert{background:rgba(52,199,89,.08);color:var(--accent-green)}
.post-tag.method{background:rgba(255,149,0,.1);color:var(--accent-amber)}
.post-tag.region{background:rgba(6,182,212,.08);color:#0891B2}
.post-bottom{display:flex;gap:16px;align-items:center}
.post-stat{display:flex;align-items:center;gap:4px;font-size:13px;color:var(--text-dim);font-weight:600}
.post-members{font-size:13px;font-weight:700;color:var(--accent-green)}
.posts-empty{text-align:center;padding:60px 24px;color:var(--text-dim)}
.posts-empty-icon{font-size:48px;margin-bottom:12px;opacity:.5}
.posts-empty p{font-size:14px;line-height:1.6}

/* ===== Study Detail Info ===== */
.detail-study-info{padding:16px;background:var(--bg-elevated);border-radius:var(--radius-md);margin-bottom:16px;display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.detail-study-badge{padding:4px 12px;border-radius:12px;font-size:12px;font-weight:700}
.detail-join-btn{padding:8px 20px;border-radius:20px;border:none;font-size:13px;font-weight:800;cursor:pointer;font-family:inherit;transition:all var(--transition);margin-left:auto}
.detail-join-btn.join{background:linear-gradient(135deg,#34C759,#30D158);color:#fff}
.detail-join-btn.leave{background:var(--bg-card);color:var(--text-muted);border:1px solid var(--border)}

/* ===== Modals ===== */
.modal-overlay{position:fixed;inset:0;z-index:300;background:rgba(0,0,0,0.4);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:all .3s ease;padding:24px}
.modal-overlay.active{opacity:1;visibility:visible}
.modal-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);width:100%;transform:translateY(20px) scale(.95);transition:all .4s cubic-bezier(.16,1,.3,1);box-shadow:0 24px 48px rgba(0,0,0,0.12)}
.modal-overlay.active .modal-card{transform:translateY(0) scale(1)}
.write-modal-card{max-width:520px;padding:32px}
.post-detail-card{max-width:600px;padding:32px;max-height:80vh;overflow-y:auto}
.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}
.modal-title{font-size:20px;font-weight:900;letter-spacing:-.5px;color:var(--text-primary)}
.modal-close-btn{width:32px;height:32px;border-radius:8px;border:1px solid var(--border);background:var(--bg-elevated);color:var(--text-secondary);font-size:14px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition);flex-shrink:0}
.modal-close-btn:hover{background:var(--border);color:var(--text-primary)}
.write-form{display:flex;flex-direction:column;gap:12px}
.form-row{display:flex;gap:12px}
.form-input{width:100%;padding:12px 16px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-elevated);color:var(--text-primary);font-size:15px;font-family:inherit;font-weight:600;outline:none;transition:border-color .3s ease,box-shadow .3s ease}
.form-input:focus{border-color:var(--accent-blue);box-shadow:0 0 0 3px rgba(49,130,246,.1)}
.form-input::placeholder{color:var(--text-dim);font-weight:500}
.form-select{width:100%;padding:12px 16px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-elevated);color:var(--text-primary);font-size:14px;font-family:inherit;font-weight:600;outline:none;cursor:pointer;transition:border-color .3s ease}
.form-select:focus{border-color:var(--accent-blue);box-shadow:0 0 0 3px rgba(49,130,246,.1)}
.form-textarea{width:100%;padding:12px 16px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-elevated);color:var(--text-primary);font-size:15px;font-family:inherit;font-weight:500;outline:none;resize:vertical;min-height:120px;line-height:1.6;transition:border-color .3s ease}
.form-textarea:focus{border-color:var(--accent-blue);box-shadow:0 0 0 3px rgba(49,130,246,.1)}
.form-textarea::placeholder{color:var(--text-dim)}
.modal-submit{padding:14px 0;border-radius:var(--radius-md);border:none;background:var(--accent-blue);color:#fff;font-size:16px;font-weight:700;cursor:pointer;font-family:inherit;transition:all var(--transition);box-shadow:0 4px 16px rgba(49,130,246,.2);margin-top:4px}
.modal-submit:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(49,130,246,.3);background:#1B6DE8}

/* Post Detail */
.detail-meta{display:flex;align-items:center;gap:12px;margin-bottom:16px;flex-wrap:wrap}
.detail-nickname{font-size:14px;font-weight:700;color:var(--text-secondary)}
.detail-time{font-size:13px;color:var(--text-dim);font-weight:600}
.detail-body{font-size:15px;color:var(--text-secondary);line-height:1.8;margin-bottom:20px;white-space:pre-wrap;word-break:break-word}
.detail-actions{display:flex;gap:12px;padding-bottom:20px;border-bottom:1px solid var(--border);margin-bottom:20px}
.like-btn{display:flex;align-items:center;gap:6px;padding:8px 16px;border-radius:20px;border:1px solid var(--border);background:var(--bg-elevated);color:var(--text-muted);font-size:13px;font-weight:700;cursor:pointer;transition:all var(--transition);font-family:inherit}
.like-btn:hover{border-color:#CED4DA;color:var(--text-secondary)}
.like-btn.liked{border-color:var(--accent-red);background:rgba(255,59,48,.06);color:var(--accent-red)}
.detail-comments{margin-bottom:16px}
.comments-title{font-size:14px;font-weight:800;margin-bottom:12px;color:var(--text-secondary)}
.comment-item{padding:12px 0;border-bottom:1px solid var(--border)}
.comment-item:last-child{border-bottom:none}
.comment-top{display:flex;align-items:center;gap:8px;margin-bottom:4px}
.comment-nickname{font-size:13px;font-weight:700;color:var(--text-secondary)}
.comment-time{font-size:11px;color:var(--text-dim);font-weight:600}
.comment-text{font-size:14px;color:var(--text-muted);line-height:1.5}
.comment-form{display:flex;gap:8px}
.comment-form .form-input{flex:1;font-size:14px;padding:10px 14px}
.comment-submit-btn{padding:10px 18px;border-radius:var(--radius-sm);border:none;background:var(--accent-blue);color:#fff;font-size:13px;font-weight:700;cursor:pointer;font-family:inherit;transition:all var(--transition);white-space:nowrap}
.comment-submit-btn:hover{background:#1B6DE8}

/* ===== About ===== */
.about-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.about-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:32px 24px;text-align:center;transition:all var(--transition);box-shadow:0 2px 8px rgba(0,0,0,0.08)}
.about-card:hover{border-color:#CED4DA;transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,0.1)}
.about-icon{font-size:36px;margin-bottom:16px}
.about-card h3{font-size:18px;font-weight:800;margin-bottom:8px;letter-spacing:-.5px;color:var(--text-primary)}
.about-card p{font-size:14px;color:var(--text-muted);line-height:1.7}

/* ===== Footer ===== */
.site-footer{background:#1B1D6A;padding:60px 0 30px;color:#fff}
.footer-container{max-width:960px;margin:0 auto;padding:0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px}
.footer-logo{font-size:20px;font-weight:800;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.footer-tagline{font-size:14px;color:rgba(255,255,255,0.6);line-height:1.6}
.footer-col h4{font-size:14px;font-weight:700;margin-bottom:16px;color:rgba(255,255,255,0.9)}
.footer-col a{display:block;font-size:13px;color:rgba(255,255,255,0.5);text-decoration:none;margin-bottom:10px;transition:color 0.2s}
.footer-col a:hover{color:#3182F6}
.footer-divider{height:1px;background:rgba(255,255,255,0.1);margin:40px 0 20px}
.footer-business{text-align:center}
.footer-business-info{font-size:12px;color:rgba(255,255,255,0.5);line-height:1.8;margin-bottom:8px}
.footer-business-links{display:flex;justify-content:center;gap:12px;align-items:center;margin-bottom:8px}
.footer-business-links a{font-size:12px;color:rgba(255,255,255,0.5);text-decoration:none;transition:color 0.2s}
.footer-business-links a:hover{color:#3182F6}
.footer-business-links span{color:rgba(255,255,255,0.2);font-size:12px}
.footer-copyright{font-size:12px;color:rgba(255,255,255,0.4);text-align:center}

/* ===== Auth Modal ===== */
.auth-modal-card{max-width:420px;padding:32px}
.auth-form{display:flex;flex-direction:column;gap:16px}
.auth-field{display:flex;flex-direction:column;gap:6px}
.auth-label{font-size:13px;font-weight:700;color:var(--text-secondary)}
.auth-required{color:var(--accent-red);font-weight:800}
.auth-input{transition:border-color .3s ease,box-shadow .3s ease}
.auth-input:focus{border-color:var(--accent-blue);box-shadow:0 0 0 3px rgba(49,130,246,.12)}
.auth-input.input-error{border-color:var(--accent-red);box-shadow:0 0 0 3px rgba(255,59,48,.08)}
.auth-input.input-valid{border-color:var(--accent-green);box-shadow:0 0 0 3px rgba(52,199,89,.08)}
.auth-error{font-size:12px;font-weight:600;color:var(--accent-red);min-height:16px;transition:opacity .2s ease}
.auth-server-error{text-align:center;font-size:13px;font-weight:700;min-height:18px}
.auth-submit{margin-top:4px}
.auth-switch{text-align:center;font-size:13px;color:var(--text-muted);font-weight:600;margin-top:4px}
.auth-switch a{color:var(--accent-blue);text-decoration:none;font-weight:700;transition:color .2s ease}
.auth-switch a:hover{color:#1B6DE8;text-decoration:underline}
input[type="date"].auth-input{color-scheme:light}

/* ===== Responsive ===== */
@media(max-width:768px){
  .nav-links{display:none}
  .nav-auth .nav-cta-register{display:none}
  .nav-user-name{max-width:80px;overflow:hidden;text-overflow:ellipsis}
  .about-grid{grid-template-columns:1fr}
  .hero-stats{gap:20px}.hero-stat-num{font-size:22px}
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .calendar-wrapper{padding:20px 12px}
  .cal-cell{min-height:44px}.cal-day-num{font-size:11px}.cal-dot{width:5px;height:5px}
  .sector-header{padding:20px}.sector-tags{padding:0 20px 20px}
  .post-detail-card{max-height:90vh}
  .form-row{flex-direction:column}
  .always-exam-grid{grid-template-columns:1fr}
  .cert-info-grid{grid-template-columns:1fr}
  .cert-detail-modal-card{max-height:90vh;padding:24px}
  .always-exam-box,.upcoming-section{padding:20px}
  .ranking-item{padding:12px 14px;gap:10px}
  .comm-tab{padding:8px 14px;font-size:12px}
}
@media(max-width:480px){
  .hero{padding:100px 16px 60px}
  .hero-actions{flex-direction:column;align-items:stretch;padding:0 20px}
  .community-tabs{gap:4px}
  .comm-tab{padding:7px 12px;font-size:11px}
  .sector-name{font-size:17px}
  .sector-icon-box{width:48px;height:48px;font-size:24px}
  .cert-tag{padding:6px 14px;font-size:13px}
  .always-exam-item{flex-direction:column;align-items:flex-start;gap:4px}
  .always-exam-name{min-width:auto}
}