/* =============================================================
   活动报名平台 V2.0 — Genesis Design System
   designmd.ai/chef/genesis
   Editorial precision — bold display, generous spacing, gallery-card surfaces
   ============================================================= */

/* ── Fonts (Genesis stack) ──────────────────────────────── */
/* General Sans from Fontshare (display), DM Sans + JetBrains Mono from Google Fonts */
@import url('https://api.fontshare.com/v2/css?f[]=general-sans@400,500,600,700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Design Token System (Genesis palette) ───────────────── */
:root {
    /* Brand — Indigo */
    --color-primary: #6366F1;
    --color-primary-dark: #4F46E5;
    --color-primary-hover: #4F46E5;
    --color-primary-light: rgba(99,102,241,0.06);
    --color-primary-border: rgba(99,102,241,0.18);
    --color-primary-glow: rgba(99,102,241,0.35);
    --color-primary-ring: rgba(99,102,241,0.12);
    --color-secondary: #20970B;   /* DESIGN.md accent */

    /* Surface — warm white */
    --color-bg: #FAFAFA;
    --color-white: #FFFFFF;
    --color-surface: #FFFFFF;
    --color-surface-alt: #F4F4F6;
    --color-surface-elevated: #FFFFFF;
    --color-neutral: #9C9C9C;
    --color-neutral-bg: #F4F4F6;

    /* Text — near-black editorial */
    --color-text: #0A0A0A;
    --color-text-light: #6B6B6B;
    --color-text-secondary: #6B6B6B;
    --color-text-muted: #9C9C9C;

    /* Border — recessive */
    --color-border: #E8E8EC;
    --color-border-light: #F0F0F4;

    /* Error */
    --color-danger: #EF4444;
    --color-danger-dark: #DC2626;
    --color-danger-bg: rgba(239,68,68,0.06);
    --color-danger-border: rgba(239,68,68,0.18);
    --color-error: #EF4444;
    --color-error-dark: #DC2626;
    --color-error-bg: rgba(239,68,68,0.06);
    --color-error-border: rgba(239,68,68,0.18);

    /* Success */
    --color-success: #10B981;
    --color-success-dark: #059669;
    --color-success-bg: rgba(16,185,129,0.06);
    --color-success-border: rgba(16,185,129,0.18);

    /* Warning */
    --color-warning: #F59E0B;
    --color-warning-dark: #D97706;
    --color-warning-bg: rgba(245,158,11,0.06);
    --color-warning-border: rgba(245,158,11,0.18);

    /* Info */
    --color-info: #6366F1;
    --color-info-bg: rgba(99,102,241,0.04);

    /* Radii — Genesis: 4/6/8/12/9999 */
    --radius: 6px;           /* buttons, inputs */
    --radius-sm: 4px;        /* chips, badges, inline code */
    --radius-lg: 8px;        /* dropdowns, panels */
    --radius-xl: 12px;       /* cards, search bar */
    --radius-full: 9999px;   /* avatars, pill badges, status dots */

    /* Elevation — minimal, only on hover */
    --shadow: none;
    --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
    --shadow-dropdown: 0 8px 32px rgba(0,0,0,0.10);
    --shadow-button-glow: 0 4px 12px rgba(99,102,241,0.35);

    /* Transition */
    --transition: all 0.15s ease;
    --transition-lift: all 0.20s ease;

    /* Sizing */
    --max-width: 1280px;
    --container-padding: 24px;

    /* Typography — General Sans (display) + DM Sans (body) */
    --font-display: 'General Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-code: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;
    --line-height-body: 1.55;
    --line-height-heading: 1.2;
}

/* ── Base ────────────────────────────────────────────────── */
body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    font-size: 15px;                      /* Genesis body: 15px */
    line-height: var(--line-height-body);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--container-padding); }
main.container { padding-top: 50px; padding-bottom: 0; }
a { color: var(--color-primary); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--color-primary-dark); text-decoration: none; }

/* Ensure button-link colors always take priority over link states */
a.btn-primary,
a.btn-primary:visited,
a.btn-primary:hover { color: #FFF; }
a.btn-secondary,
a.btn-secondary:visited { color: var(--color-text); }
a.btn-outline,
a.btn-outline:visited { color: var(--color-text); }
a.btn-ghost,
a.btn-ghost:visited { color: var(--color-text-secondary); }
a.btn-danger,
a.btn-danger:visited,
a.btn-danger:hover { color: #FFF; }
a.btn-warning,
a.btn-warning:visited,
a.btn-warning:hover { color: #FFF; }
a.btn-success,
a.btn-success:visited,
a.btn-success:hover { color: #FFF; }

/* ── Typography (Genesis: General Sans display, DM Sans body) ── */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: var(--line-height-heading);
    color: var(--color-text);
    letter-spacing: -0.03em;
}
h1 { font-size: 2rem; margin-bottom: 1.25rem; }           /* 32px section heading */
h2 { font-size: 1.5rem; margin-bottom: 1rem; }            /* 24px subhead */
h3 { font-size: 1.125rem; margin-bottom: 0.5rem; }        /* 18px */
h4 { font-size: 0.9375rem; margin-bottom: 0.5rem; }       /* 15px — body size */
p { margin-bottom: 0.75rem; }

/* ── Navbar (Genesis: 56px, backdrop-blur, 1px border) ──── */
.navbar {
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    height: 56px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; width: 100%; }
.brand {
    font-family: var(--font-display);
    font-size: 1rem; font-weight: 700;
    color: var(--color-text);
    text-decoration: none; white-space: nowrap; line-height: 56px;
    letter-spacing: -0.03em;
}
.brand:hover { color: var(--color-primary); text-decoration: none; }
.nav-links { display: flex; gap: 4px; align-items: center; flex-wrap: wrap; height: 56px; }
.nav-links a {
    padding: 8px 14px; border-radius: var(--radius);
    text-decoration: none; color: var(--color-text-secondary);
    font-family: var(--font-body); font-size: 0.875rem; font-weight: 500;  /* 14px medium */
    transition: var(--transition); white-space: nowrap; line-height: 1.4;
}
.nav-links a:hover { background: var(--color-surface-alt); color: var(--color-text); text-decoration: none; }
.nav-links a.active { background: var(--color-primary-light); color: var(--color-primary); text-decoration: none; }
.nav-user { display: flex; align-items: center; gap: 8px; font-size: 0.875rem; color: var(--color-text-secondary); }
.nav-user .nav-username { font-weight: 500; color: var(--color-text); }
.nav-divider { width: 1px; height: 16px; background: var(--color-border); margin: 0 4px; }

/* ── Main ────────────────────────────────────────────────── */
main { flex: 1; padding: 50px 0; }

/* ── Footer ──────────────────────────────────────────────── */
.footer { background: var(--color-surface); border-top: 1px solid var(--color-border); padding: 20px 0; text-align: center; color: var(--color-text-secondary); font-size: 0.8125rem; }  /* 13px */

/* ── Buttons (Genesis: 6px radius, hover lift, indigo glow) ── */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    border-radius: var(--radius); font-family: var(--font-body);
    font-weight: 500; text-decoration: none; border: 1px solid transparent;
    cursor: pointer; transition: var(--transition); text-align: center; white-space: nowrap;
    gap: 6px;
    /* Sizes via modifiers */
    padding: 8px 16px; height: 38px; font-size: 0.875rem;  /* medium (default) */
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary {
    background: var(--color-primary); color: #FFF; border-color: var(--color-primary);
}
.btn-primary:hover {
    background: var(--color-primary-dark); border-color: var(--color-primary-dark);
    color: #FFF; box-shadow: var(--shadow-button-glow);
}
.btn-secondary { background: var(--color-surface); color: var(--color-text); border: 1px solid var(--color-border); }
.btn-secondary:hover { background: var(--color-surface-alt); border-color: var(--color-neutral); }
.btn-outline { background: transparent; color: var(--color-text); border: 1px solid var(--color-border); }
.btn-outline:hover { background: var(--color-surface-alt); border-color: var(--color-neutral); }
.btn-ghost { background: transparent; color: var(--color-text-secondary); border-color: transparent; }
.btn-ghost:hover { background: var(--color-surface-alt); color: var(--color-text); transform: none; }
.btn-danger { background: var(--color-danger); color: #FFF; border-color: var(--color-danger); }
.btn-danger:hover { background: var(--color-danger-dark); border-color: var(--color-danger-dark); color: #FFF; }
.btn-warning { background: var(--color-warning); color: #FFF; border-color: var(--color-warning); }
.btn-warning:hover { background: var(--color-warning-dark); border-color: var(--color-warning-dark); color: #FFF; }
.btn-success { background: var(--color-success); color: #FFF; border-color: var(--color-success); }
.btn-success:hover { background: var(--color-success-dark); border-color: var(--color-success-dark); color: #FFF; }
.btn-sm { padding: 6px 12px; height: 32px; font-size: 0.8125rem; }    /* small 32px */
.btn-lg { padding: 10px 20px; height: 44px; font-size: 0.9375rem; }   /* large 44px */
.btn-block { display: flex; width: 100%; }
.btn:disabled, .btn[disabled] { opacity: 0.40; cursor: not-allowed; pointer-events: none; transform: none; }

/* ── Forms (Genesis: 6px radius, 3px indigo focus ring) ──── */
.form-card { background: var(--color-surface); padding: 28px; border-radius: var(--radius-xl); border: 1px solid var(--color-border); max-width: 640px; }
.form-row { margin-bottom: 16px; }
.form-row label { display: block; margin-bottom: 6px; font-weight: 500; font-family: var(--font-body); font-size: 0.875rem; color: var(--color-text); }
.form-row input, .form-row textarea, .form-row select {
    width: 100%; padding: 10px 14px; border: 1px solid var(--color-border);
    border-radius: var(--radius); font-family: var(--font-body); font-size: 0.875rem;  /* 14px */
    transition: border-color 0.15s, box-shadow 0.15s; background: var(--color-surface); color: var(--color-text); line-height: 1.4;
}
.form-row input::placeholder, .form-row textarea::placeholder { color: var(--color-text-muted); }
.form-row input:focus, .form-row textarea:focus, .form-row select:focus {
    outline: none; border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-ring);              /* Genesis: 3px indigo ring */
}
.form-row input:disabled, .form-row textarea:disabled, .form-row select:disabled {
    background: var(--color-bg); color: var(--color-text-muted); cursor: not-allowed; opacity: 0.5;
}
.form-row textarea { min-height: 80px; resize: vertical; }
.form-row select {
    cursor: pointer; appearance: none; -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B6B6B' d='M3 4.5l3 3 3-3' stroke='%236B6B6B' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px;
}
.form-row small { display: block; margin-top: 4px; font-size: 0.75rem; color: var(--color-text-muted); }
.required { color: var(--color-danger); }
.form-actions { display: flex; gap: 10px; margin-top: 24px; flex-wrap: wrap; }
.checkbox-label { display: flex !important; align-items: center; gap: 8px; font-weight: 400 !important; font-size: 0.875rem !important; cursor: pointer; color: var(--color-text) !important; }
.checkbox-label input[type="checkbox"] { width: 18px; height: 18px; cursor: pointer; accent-color: var(--color-primary); border-radius: 4px; }

/* ── File Upload (Genesis: clean, bordered) ──────────────── */
.file-upload { border: 2px dashed var(--color-border); border-radius: var(--radius-xl); padding: 32px 24px; text-align: center; cursor: pointer; transition: var(--transition); background: var(--color-bg); position: relative; }
.file-upload:hover, .file-upload.dragover { border-color: var(--color-primary); background: var(--color-primary-light); }
.file-upload-icon { font-size: 2rem; color: var(--color-text-muted); margin-bottom: 8px; }
.file-upload-text { font-size: 0.875rem; color: var(--color-text-secondary); margin-bottom: 4px; font-weight: 500; }
.file-upload-hint { font-size: 0.75rem; color: var(--color-text-muted); }   /* 12px caption */
.file-upload input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.upload-preview { margin-top: 12px; display: flex; align-items: flex-start; gap: 12px; }
.upload-preview img { width: 200px; height: 150px; object-fit: cover; border-radius: var(--radius); border: 1px solid var(--color-border); }
.upload-preview-info { font-size: 0.8125rem; color: var(--color-text-secondary); }
.upload-preview-remove { color: var(--color-danger); cursor: pointer; font-size: 0.8125rem; margin-top: 4px; }
.current-image { margin-bottom: 8px; }
.current-image img { max-width: 300px; max-height: 200px; display: block; border-radius: var(--radius); border: 1px solid var(--color-border); margin-bottom: 4px; object-fit: cover; }
.current-image small { color: var(--color-text-muted); font-size: 0.75rem; }

/* ── Alerts / Flash Messages ─────────────────────────────── */
.alert { padding: 10px 16px; border-radius: var(--radius); margin-bottom: 16px; font-size: 0.875rem; font-weight: 500; border: 1px solid transparent; }
.alert-error { background: var(--color-error-bg); color: var(--color-error); border-color: var(--color-error-border); }
.alert-success { background: var(--color-success-bg); color: var(--color-success-dark); border-color: var(--color-success-border); }
.alert-warning { background: var(--color-warning-bg); color: var(--color-warning-dark); border-color: var(--color-warning-border); }
.alert-info { background: var(--color-info-bg); color: var(--color-primary-dark); border-color: var(--color-primary-border); }
.flash-banner { padding: 10px 24px; text-align: center; font-size: 0.875rem; font-weight: 500; animation: flashIn 0.20s ease; }
@keyframes flashIn { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: translateY(0); } }
.flash-banner.flash-success { background: var(--color-success-bg); color: var(--color-success-dark); border-bottom: 1px solid var(--color-success-border); }
.flash-banner.flash-error { background: var(--color-error-bg); color: var(--color-error); border-bottom: 1px solid var(--color-error-border); }
.flash-banner.flash-warning { background: var(--color-warning-bg); color: var(--color-warning-dark); border-bottom: 1px solid var(--color-warning-border); }

/* ── Badges / Chips (Genesis: rounded-full pills) ────────── */
.badge { display: inline-block; padding: 4px 12px; border-radius: var(--radius-full); font-family: var(--font-body); font-size: 0.75rem; font-weight: 500; white-space: nowrap; line-height: 1.4; }   /* 12px pill */
.badge-success { background: var(--color-success-bg); color: var(--color-success-dark); }
.badge-cancelled { background: var(--color-error-bg); color: var(--color-error); }
.badge-warning { background: var(--color-warning-bg); color: var(--color-warning-dark); }
.badge-info { background: var(--color-info-bg); color: var(--color-primary-dark); }
.badge-neutral { background: var(--color-neutral-bg); color: var(--color-text-secondary); }
.badge-danger { background: var(--color-error-bg); color: var(--color-error); }
.badge-super { background: var(--color-primary-light); color: var(--color-primary); font-weight: 600; }
.badge-admin { background: var(--color-neutral-bg); color: var(--color-text-secondary); font-weight: 500; }
.badge-active { background: var(--color-success-bg); color: var(--color-success-dark); }
.badge-disabled { background: var(--color-error-bg); color: var(--color-error); }
.badge-ended { background: var(--color-neutral-bg); color: var(--color-text-muted); }
.badge-full { background: var(--color-error-bg); color: var(--color-error); font-weight: 600; }
.badge-almost-full { background: var(--color-warning-bg); color: var(--color-warning-dark); font-weight: 600; }
.full-badge { color: var(--color-error); font-size: 0.8125rem; font-weight: 600; }

/* ── Tables (Genesis: clean, bordered, subtle hover) ─────── */
.data-table {
    width: 100%; border-collapse: collapse; background: var(--color-surface);
    border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--color-border);
}
.data-table th:last-child,
.data-table td:last-child { white-space: nowrap; }  /* 操作列不换行 */

/* 小屏幕表格可横向滚动 */
.table-scroll {
    width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-lg); border: 1px solid var(--color-border);
}
.table-scroll .data-table { border: none; border-radius: 0; }
.data-table th, .data-table td {
    padding: 12px 16px; text-align: left;
    border-bottom: 1px solid var(--color-border-light);
    font-family: var(--font-body); font-size: 0.875rem; vertical-align: middle;
}
.data-table th {
    background: var(--color-surface-alt); font-weight: 600; color: var(--color-text-secondary);
    font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em;
    border-bottom: 1px solid var(--color-border);
}
.data-table tr:nth-child(even) td { background: var(--color-bg); }
.data-table tr:hover td { background: var(--color-surface-alt); }
.data-table tr:last-child td { border-bottom: none; }

/* ── Activity Cards (Genesis: 12px radius, hover lift) ───── */
.activities { display: flex; flex-direction: column; gap: 24px; }         /* card grid gap 24px */
.activity-card {
    background: var(--color-surface); border-radius: var(--radius-xl);    /* 12px */
    border: 1px solid var(--color-border); padding: 0; overflow: hidden;
    transition: var(--transition-lift);                                    /* 200ms */
}
.activity-card:hover {
    box-shadow: var(--shadow-md); transform: translateY(-2px);            /* hover lift */
}
.activity-header { display: flex; gap: 20px; padding: 20px 24px; }
.activity-cover { flex-shrink: 0; width: 200px; height: 150px; border-radius: var(--radius-lg); overflow: hidden; background: var(--color-bg); border: 1px solid var(--color-border); }
.activity-cover img { width: 100%; height: 100%; object-fit: cover; }
.activity-cover-placeholder { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; color: var(--color-text-muted); font-size: 2rem; background: var(--color-bg); }
.activity-info { flex: 1; min-width: 0; }
.activity-name { color: var(--color-text); font-family: var(--font-display); font-size: 1.25rem; font-weight: 700; margin-bottom: 6px; letter-spacing: -0.03em; }
.activity-desc { color: var(--color-text-secondary); margin-bottom: 4px; white-space: pre-line; font-size: 0.875rem; overflow-wrap: break-word; }
.activity-location { color: var(--color-text-secondary); font-size: 0.8125rem; margin-bottom: 4px; }

/* ── Session Table within Card ────────────────────────────── */
.session-table { width: 100%; border-collapse: collapse; margin: 0; }
.session-table th, .session-table td { padding: 10px 16px; text-align: left; border-bottom: 1px solid var(--color-border-light); font-family: var(--font-body); font-size: 0.875rem; vertical-align: middle; }
.session-table th { background: var(--color-surface-alt); font-weight: 600; color: var(--color-text-secondary); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; border-top: 1px solid var(--color-border); }
.session-table tr:nth-child(even) td { background: var(--color-bg); }
.session-table tr.ended { opacity: 0.40; }
.session-table tr.full { opacity: 0.50; }
.session-table tr.almost-full { background: var(--color-warning-bg); }
.session-status-badge { display: inline-block; padding: 4px 12px; border-radius: var(--radius-full); font-size: 0.75rem; font-weight: 500; }

/* ── User Info / Registration Form ────────────────────────── */
.user-info { background: var(--color-bg); border-top: 1px solid var(--color-border); padding: 20px 24px; }
.user-info h3 { font-family: var(--font-display); font-size: 1rem; margin-bottom: 14px; padding-bottom: 0; border-bottom: none; font-weight: 600; letter-spacing: -0.02em; }
.user-info .form-row { max-width: 420px; }
.login-hint { background: var(--color-primary-light); border-top: 1px solid var(--color-primary-border); border-bottom: 1px solid var(--color-primary-border); padding: 12px 20px; font-size: 0.875rem; color: var(--color-primary-dark); text-align: center; }
.login-hint a { font-weight: 600; color: var(--color-primary); }

/* ── Stats Grid (Genesis: gallery-card style) ─────────────── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 32px; }
.stat-card {
    background: var(--color-surface); border-radius: var(--radius-xl);
    border: 1px solid var(--color-border); padding: 24px 20px; text-align: center;
    transition: var(--transition-lift);
}
.stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.stat-number { font-family: var(--font-display); font-size: 2.5rem; font-weight: 700; color: var(--color-primary); line-height: 1.1; letter-spacing: -0.04em; }
.stat-label { font-size: 0.8125rem; color: var(--color-text-secondary); margin-top: 6px; font-weight: 500; }

/* ── Page Header ──────────────────────────────────────────── */
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 16px; }
.page-header h1 { margin-bottom: 0; }

/* ── Toolbar ──────────────────────────────────────────────── */
.toolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; }
.search-box { display: flex; gap: 8px; align-items: center; }
.search-box input { padding: 10px 14px; border: 1px solid var(--color-border); border-radius: var(--radius); font-family: var(--font-body); font-size: 0.875rem; width: 260px; transition: border-color 0.15s, box-shadow 0.15s; background: var(--color-surface); color: var(--color-text); }
.search-box input::placeholder { color: var(--color-text-muted); }
.search-box input:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-ring); }

/* ── Filter Bar ───────────────────────────────────────────── */
.filter-bar { display: flex; gap: 10px; margin-bottom: 20px; flex-wrap: wrap; align-items: center; }
.filter-bar select { padding: 10px 36px 10px 14px; border: 1px solid var(--color-border); border-radius: var(--radius); font-family: var(--font-body); font-size: 0.875rem; background: var(--color-surface); color: var(--color-text); cursor: pointer; min-width: 140px; appearance: none; -webkit-appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B6B6B' d='M3 4.5l3 3 3-3' stroke='%236B6B6B' stroke-width='1.5' fill='none'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; }
.filter-bar select:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-ring); }

/* ── Pagination ───────────────────────────────────────────── */
.pagination { display: flex; justify-content: center; align-items: center; gap: 4px; margin-top: 24px; flex-wrap: wrap; }
.pagination a, .pagination span { display: inline-flex; align-items: center; justify-content: center; min-width: 36px; height: 36px; padding: 0 8px; border-radius: var(--radius); font-family: var(--font-body); font-size: 0.875rem; text-decoration: none; font-weight: 500; border: 1px solid var(--color-border); background: var(--color-surface); color: var(--color-text-secondary); transition: var(--transition); }
.pagination a:hover { background: var(--color-primary-light); border-color: var(--color-primary); color: var(--color-primary); text-decoration: none; }
.pagination span.current { background: var(--color-primary); color: #FFF; border-color: var(--color-primary); font-weight: 600; }
.pagination span.ellipsis { border: none; background: transparent; color: var(--color-text-muted); }
.pagination .pagination-info { margin-left: 12px; font-size: 0.8125rem; color: var(--color-text-muted); }

/* ── Login Box ────────────────────────────────────────────── */
.login-box { max-width: 420px; margin: 80px auto 0; background: var(--color-surface); padding: 36px 32px; border-radius: var(--radius-xl); border: 1px solid var(--color-border); }
.login-box h1 { text-align: center; margin-bottom: 24px; font-size: 1.25rem; font-weight: 700; letter-spacing: -0.03em; }
.login-box .form-row input { padding: 12px 14px; }
.hint { text-align: center; color: var(--color-text-secondary); font-size: 0.8125rem; margin-top: 18px; }
.hint a { font-weight: 600; color: var(--color-primary); }

/* ── Result / Registration Feedback ───────────────────────── */
.result-summary { background: var(--color-primary-light); border: 1px solid var(--color-primary-border); border-radius: var(--radius); padding: 12px 16px; margin-bottom: 16px; font-weight: 500; font-size: 0.9375rem; color: var(--color-primary-dark); }
.result-list { list-style: none; margin-bottom: 20px; }
.result-item { padding: 10px 16px; border-radius: var(--radius); margin-bottom: 6px; font-size: 0.875rem; font-weight: 500; border: 1px solid transparent; }
.result-item.success { background: var(--color-success-bg); color: var(--color-success-dark); border-color: var(--color-success-border); }
.result-item.fail { background: var(--color-error-bg); color: var(--color-error); border-color: var(--color-error-border); }

/* ── Misc Sections ────────────────────────────────────────── */
.action-links { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.participant-info { background: var(--color-surface); border-radius: var(--radius-xl); border: 1px solid var(--color-border); padding: 16px 20px; margin-bottom: 20px; display: flex; gap: 24px; flex-wrap: wrap; }
.participant-info p { font-size: 0.875rem; color: var(--color-text); margin-bottom: 0; }
.participant-info strong { color: var(--color-text-secondary); font-weight: 500; }
td.actions { white-space: nowrap; }
.actions { display: inline-flex; gap: 6px; align-items: center; flex-wrap: nowrap; }
.actions form { display: inline-flex; align-items: center; }
.actions .btn,
.actions .badge { flex-shrink: 0; }
.quick-actions { display: flex; gap: 10px; margin-top: 24px; flex-wrap: wrap; }

/* ── Profile Sections ─────────────────────────────────────── */
.profile-section { background: var(--color-surface); border-radius: var(--radius-xl); border: 1px solid var(--color-border); padding: 24px; margin-bottom: 20px; }
.profile-section h2 { font-family: var(--font-display); margin-bottom: 18px; padding-bottom: 12px; border-bottom: 1px solid var(--color-border); font-size: 1.125rem; font-weight: 700; letter-spacing: -0.03em; }
.profile-section .form-row { max-width: 480px; }
.info-table { width: 100%; max-width: 480px; border-collapse: collapse; }
.info-table td { padding: 10px 0; border-bottom: 1px solid var(--color-border-light); font-size: 0.875rem; vertical-align: middle; }
.info-table td:first-child { color: var(--color-text-secondary); font-weight: 500; width: 110px; }
.info-table tr:last-child td { border-bottom: none; }
.welcome-text { color: var(--color-text-secondary); font-size: 0.875rem; margin-bottom: 24px; }
.nav-back { margin-top: 24px; }
.nav-back a { color: var(--color-text-secondary); text-decoration: none; font-size: 0.875rem; }
.nav-back a:hover { color: var(--color-primary); }

/* ── Empty / Loading States ───────────────────────────────── */
.empty { color: var(--color-text-muted); font-size: 0.9375rem; padding: 56px 24px; text-align: center; }
.empty-icon { font-size: 3rem; margin-bottom: 16px; opacity: 0.25; }
.empty p { margin-top: 8px; font-size: 0.875rem; }
.loading { display: flex; align-items: center; justify-content: center; padding: 56px 24px; color: var(--color-text-muted); font-size: 0.9375rem; }
.loading::before { content: ""; width: 22px; height: 22px; border: 2px solid var(--color-border); border-top-color: var(--color-primary); border-radius: 50%; animation: spin 0.6s linear infinite; margin-right: 12px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Exclusion Tags ───────────────────────────────────────── */
tr.excluded td { opacity: 0.40; background: var(--color-bg); color: var(--color-text-muted); }
tr.excluded .session-checkbox { cursor: not-allowed; }
.exclusion-hint { font-size: 0.75rem; color: var(--color-warning-dark); cursor: help; margin-left: 4px; }
.badge-muted { display: inline-block; padding: 4px 12px; border-radius: var(--radius-full); font-size: 0.75rem; font-weight: 500; }
.exclusion-tags { display: flex; flex-wrap: wrap; gap: 4px; }
.exclusion-tag { display: inline-block; padding: 4px 12px; border-radius: var(--radius-full); font-size: 0.75rem; font-weight: 500; background: var(--color-warning-bg); color: var(--color-warning-dark); border: 1px solid var(--color-warning-border); white-space: nowrap; }

/* ── Accessibility ────────────────────────────────────────── */
:focus-visible { outline: 3px solid var(--color-primary); outline-offset: 2px; border-radius: 2px; }

/* ── Utility ──────────────────────────────────────────────── */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.hidden { display: none !important; }

/* ── Responsive (Genesis: generous spacing scales down) ───── */
@media (max-width: 768px) {
    :root { --container-padding: 16px; }
    main { padding: 40px 0; }
    .navbar { height: auto; min-height: 56px; padding: 8px 0; }
    .navbar .container { flex-direction: column; gap: 8px; }
    .nav-links { gap: 2px; justify-content: center; height: auto; }
    .nav-links a { padding: 6px 10px; font-size: 0.8125rem; }
    .login-box { margin-top: 48px; padding: 28px 20px; }
    .stats-grid { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
    .stat-number { font-size: 2rem; }
    .activity-header { flex-direction: column; }
    .activity-cover { width: 100%; height: 200px; }
    .activity-header { padding: 16px; }
    .data-table th, .data-table td { padding: 8px 10px; font-size: 0.8125rem; }
    .session-table th, .session-table td { padding: 8px 10px; font-size: 0.8125rem; }
    .form-card { padding: 20px; }
    .profile-section { padding: 20px; }
    .toolbar { flex-direction: column; align-items: stretch; }
    .search-box { width: 100%; }
    .search-box input { flex: 1; width: auto; }
    .filter-bar { flex-direction: column; }
    .filter-bar select { width: 100%; }
    .pagination { gap: 2px; }
    .pagination a, .pagination span { min-width: 32px; height: 32px; font-size: 0.8125rem; }
    .actions { flex-direction: column; gap: 4px; align-items: stretch; }
    .actions .btn { width: 100%; text-align: center; justify-content: center; }
    .page-header { flex-direction: column; align-items: flex-start; }
    .form-actions { flex-direction: column; }
    .form-actions .btn { width: 100%; text-align: center; }
    .upload-preview { flex-direction: column; }
    .upload-preview img { width: 100%; height: auto; max-height: 200px; }
}
@media (max-width: 480px) {
    h1 { font-size: 1.5rem; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .stat-card { padding: 18px 12px; }
    .stat-number { font-size: 1.75rem; }
    .activity-card { padding: 0; }
    .activity-header { padding: 14px; }
    .file-upload { padding: 20px 14px; }
    .user-info { padding: 16px; }
}