:root {
    --green: #004d26;
    --gold: #d4af37;
    --page-bg: #f2f2f2;
    --surface: #ffffff;
    --surface-muted: #fafafa;
    --surface-input: #ffffff;
    --border: #ddd;
    --border-soft: #eee;
    --text: #1a1a1a;
    --text-secondary: #444444;
    --text-muted: #666666;
    --text-dim: #888888;
    --text-inverse: #ffffff;
    --shadow: rgba(0, 0, 0, 0.1);
    --count-bg: #eeeeee;
    --btn-gray-bg: #666666;
    --btn-gray-text: #ffffff;
    --danger: #b71c1c;
    --file-strip: #fdf6e3;
    --file-strip-hover: #fef9ec;
    --header-toggle-bg: rgba(255, 255, 255, 0.14);
    --header-toggle-border: rgba(255, 255, 255, 0.4);
}

*, *::before, *::after { box-sizing: border-box; }

body {
    font-family: Arial, sans-serif;
    background-color: var(--page-bg);
    color: var(--text);
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

.header {
    background-color: var(--green);
    color: var(--text-inverse);
    padding: 12px 5%;
    border-bottom: 4px solid var(--gold);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.header-brand {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.header-brand strong {
    font-size: 13px;
    letter-spacing: 0.06em;
    opacity: 0.95;
}

.header h1 {
    margin: 0;
    font-size: 24px;
    text-transform: uppercase;
}

.container {
    max-width: 800px;
    margin: 40px auto;
    background: var(--surface);
    color: var(--text);
    padding: 30px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 6px var(--shadow);
}

.count-box {
    background: var(--count-bg);
    color: var(--text);
    padding: 10px;
    margin-bottom: 20px;
    font-weight: bold;
    border-left: 5px solid var(--green);
}

label {
    display: block;
    font-weight: bold;
    margin-top: 15px;
    color: var(--text);
}

input[type="text"],
textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    margin-top: 5px;
    border: 1px solid var(--border);
    background: var(--surface-input);
    color: var(--text);
    box-sizing: border-box;
    font-size: 16px;
}

.card {
    background: var(--surface-muted);
    padding: 15px;
    margin: 10px 0;
    border: 1px solid var(--border-soft);
    border-left: 5px solid var(--gold);
}

.btn {
    padding: 12px 24px;
    font-weight: bold;
    cursor: pointer;
    border: none;
    text-transform: uppercase;
}

a.btn { display: inline-block; text-decoration: none; text-align: center; line-height: 1.25; }
.btn-blue { background: var(--green); color: var(--text-inverse); }
.btn-gray { background: var(--btn-gray-bg); color: var(--btn-gray-text); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.float-right { float: right; }
.hidden { display: none; }

input[type="file"] {
    width: 100%;
    border: 2px dashed var(--gold);
    padding: 8px;
    margin-top: 5px;
    background: var(--file-strip);
    cursor: pointer;
    font-size: 12px;
    color: var(--text-muted);
    box-sizing: border-box;
}

input[type="file"]:hover {
    background: var(--file-strip-hover);
    border-color: var(--green);
}

.input-group {
    position: relative;
    width: 100%;
    margin-bottom: 20px;
}

#token-input {
    width: 100%;
    padding: 12px 65px 12px 12px;
    border: 1px solid var(--border);
    background: var(--surface-input);
    color: var(--text);
    box-sizing: border-box;
    font-size: 14px;
    margin-bottom: 0;
}

.toggle-btn {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--green);
    font-weight: bold;
    font-size: 12px;
    cursor: pointer;
    text-transform: uppercase;
}

.toggle-btn:hover { color: var(--gold); }

.help-muted { font-size: 12px; color: var(--text-muted); margin-bottom: 15px; }

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.flex-between h2 { margin: 0; }

.action-row {
    margin-top: 20px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
}

.action-right {
    margin-left: auto;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

.hint-line { margin: 8px 0 0; font-size: 12px; color: var(--text-muted); }

.divider { border: none; border-top: 1px solid var(--border-soft); margin: 30px 0; }

.text-muted { color: var(--text-muted); }
.text-error { color: var(--danger); }
.text-small { font-size: 13px; }

.option-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.option-card.struck .option-text {
    text-decoration: line-through;
    opacity: 0.55;
}

.label-row { margin-top: 10px; display: flex; align-items: center; gap: 6px; }

.question-card { margin-bottom: 12px; }

.question-card-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 10px;
}

.question-actions { display: flex; flex-wrap: wrap; gap: 6px; flex-shrink: 0; }
.question-title { font-size: 14px; color: var(--text); }

.option-list { margin: 8px 0 0 16px; font-size: 13px; color: var(--text-secondary); }
.option-list li { margin-bottom: 6px; }
.option-correct { color: var(--green); font-weight: bold; }
.option-desc { color: var(--text-dim); font-size: 12px; }

.media-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; font-size: 11px; }

.media-badge {
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-weight: bold;
    padding: 2px 6px;
    border-radius: 3px;
}

.media-yes { background: var(--surface-muted); color: var(--green); border: 1px solid var(--green); }
.media-no { background: var(--surface-muted); color: var(--text-muted); border: 1px solid var(--border-soft); }
.media-hint { font-size: 11px; color: var(--text-muted); margin: 6px 0 0; }

.btn-compact { padding: 4px 10px; font-size: 12px; }
.btn-delete-q { flex-shrink: 0; }

/* --- Student pages --- */

.info-box {
    background: var(--surface-muted);
    padding: 15px 20px;
    margin: 15px 0;
    border: 1px solid var(--border-soft);
    border-left: 5px solid var(--gold);
}

.step { display: flex; align-items: flex-start; gap: 15px; margin: 15px 0; }

.step-num {
    background: var(--green);
    color: var(--text-inverse);
    font-weight: bold;
    min-width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}

.step-text { padding-top: 4px; font-size: 14px; line-height: 1.6; color: var(--text); }
.step-text strong { display: inline; }
.contact-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-soft);
    font-size: 14px;
}

.contact-row:last-child { border-bottom: none; }
.contact-label { color: var(--text-muted); font-size: 12px; margin-bottom: 2px; }
.contact-value { font-weight: bold; }
.contact-value a { color: var(--green); text-decoration: none; }
.contact-value a:hover { text-decoration: underline; }

.payment-card {
    background: var(--surface-muted);
    border: 1px solid var(--border-soft);
    border-left: 5px solid var(--gold);
    padding: 15px 20px;
    margin-top: 10px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.payment-card img { width: 80px; height: auto; }
.payment-number { font-family: monospace; font-size: 18px; color: var(--green); font-weight: bold; }
.payment-note { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

.login-btn-wrap { text-align: center; margin-top: 25px; }

.container h2 { color: var(--green); font-size: 17px; margin-bottom: 5px; margin-top: 0; }
.page-student .container h2 { margin-top: 25px; }

.badge {
    display: inline-block;
    background: var(--green);
    color: var(--text-inverse);
    font-size: 11px;
    font-weight: bold;
    padding: 3px 8px;
    margin-left: 8px;
    vertical-align: middle;
    text-transform: uppercase;
}

.login-lead { color: var(--text-muted); font-size: 13px; margin-bottom: 15px; }
.login-btn-lg { font-size: 15px; padding: 14px 40px; }
.icon-slot { width: 30px; flex-shrink: 0; }
.link-back { color: var(--green); font-weight: bold; text-decoration: none; }
.link-back:hover { text-decoration: underline; }

/* Responsive Overrides */
@media (max-width: 600px) {
    .container {
        padding: 20px 16px;
        margin: 16px 12px;
        box-shadow: none;
        border-radius: 4px;
    }
    .header {
        padding: 16px 16px;
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        text-align: center;
    }
    .header-brand {
        align-items: center;
    }
    
    .payment-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    .btn {
        width: 100%;
        display: block;
        text-align: center;
    }
    .action-row {
        flex-direction: column;
        align-items: stretch;
    }
    .action-right {
        margin-left: 0;
        flex-direction: column;
        align-items: stretch;
    }
}

/* CSV import spinner & status */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  display: inline-block;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
.import-status {
  margin-top: 12px;
  padding: 10px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* --- Professional UI refresh --- */
:root {
    --green: #1155cc;
    --green-dark: #0b357f;
    --green-soft: #eaf2ff;
    --gold: #f5a623;
    --gold-soft: #fff5df;
    --page-bg: #f5f7fb;
    --surface: #ffffff;
    --surface-muted: #f8fafc;
    --surface-input: #ffffff;
    --border: #d8e0ec;
    --border-soft: #e8edf5;
    --text: #172033;
    --text-secondary: #334155;
    --text-muted: #667085;
    --text-dim: #98a2b3;
    --text-inverse: #ffffff;
    --shadow: rgba(16, 24, 40, 0.10);
    --shadow-soft: rgba(16, 24, 40, 0.06);
    --count-bg: #eef4ff;
    --btn-gray-bg: #475467;
    --btn-gray-text: #ffffff;
    --danger: #c3262f;
    --danger-soft: #fff1f2;
    --success: #12805c;
    --success-soft: #ecfdf5;
    --file-strip: #f8fafc;
    --file-strip-hover: #eef4ff;
    --radius: 8px;
    --radius-sm: 6px;
    --focus-ring: 0 0 0 4px rgba(17, 85, 204, 0.14);
}

html { background: var(--page-bg); }

body {
    font-family: "DM Sans", Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background:
        linear-gradient(180deg, #ffffff 0, var(--page-bg) 260px),
        var(--page-bg);
    color: var(--text);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text);
    font-weight: 750;
    letter-spacing: 0;
}

a { color: var(--green); }

.header {
    background: linear-gradient(135deg, var(--green-dark), var(--green));
    border-bottom: 1px solid rgba(255,255,255,0.12);
    box-shadow: 0 12px 30px rgba(11,53,127,0.18);
}

.header h1 {
    font-size: 22px;
    letter-spacing: 0;
    text-transform: none;
}

.container {
    max-width: 920px;
    margin: 44px auto;
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    box-shadow: 0 22px 60px var(--shadow-soft);
    padding: 34px;
}

.container h2 {
    color: var(--text);
    font-size: 24px;
    line-height: 1.25;
}

.help-muted,
.text-muted,
.hint-line {
    color: var(--text-muted) !important;
}

label,
.form-label {
    font-weight: 700;
    font-size: 12px;
    letter-spacing: 0;
    color: var(--text-secondary);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
textarea,
select,
.form-control,
.form-select {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface-input);
    color: var(--text);
    min-height: 42px;
    box-shadow: none;
    transition: border-color .15s ease, box-shadow .15s ease, background .15s ease;
}

textarea,
textarea.form-control {
    min-height: 104px;
}

input:focus,
textarea:focus,
select:focus,
.form-control:focus,
.form-select:focus {
    border-color: var(--green);
    box-shadow: var(--focus-ring);
    outline: none;
}

input::placeholder,
textarea::placeholder {
    color: #98a2b3;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    box-shadow: 0 12px 34px var(--shadow-soft);
    border-left: 0;
}

.card-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border-soft);
    color: var(--text);
    font-weight: 750;
}

.count-box,
.info-box {
    background: var(--green-soft);
    border: 1px solid #cfe0ff;
    border-left: 4px solid var(--green);
    border-radius: var(--radius);
}

.btn,
button.btn,
a.btn,
.btn-hero-primary,
.btn-hero-secondary,
.btn-pricing,
.btn-submit,
.nav-login,
.nav-theme,
.no-account-btn {
    border-radius: var(--radius-sm);
    font-weight: 750;
    text-transform: none;
    letter-spacing: 0;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    transition: transform .15s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease, color .15s ease;
}

.btn:hover,
.btn-hero-primary:hover,
.btn-hero-secondary:hover,
.btn-pricing:hover,
.btn-submit:hover,
.nav-login:hover,
.no-account-btn:hover {
    transform: translateY(-1px);
}

.btn:focus-visible,
button:focus-visible,
a:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.btn-primary,
.btn-blue,
.btn-hero-primary,
.btn-pricing,
.btn-submit {
    background: var(--green);
    border-color: var(--green);
    color: #fff;
    box-shadow: 0 8px 20px rgba(17,85,204,0.18);
}

.btn-primary:hover,
.btn-blue:hover,
.btn-hero-primary:hover,
.btn-pricing:hover,
.btn-submit:hover {
    background: #0d47ad;
    border-color: #0d47ad;
    color: #fff;
    box-shadow: 0 12px 26px rgba(17,85,204,0.24);
}

.btn-secondary,
.btn-gray,
.btn-hero-secondary {
    background: #fff;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    box-shadow: 0 4px 12px var(--shadow-soft);
}

.btn-secondary:hover,
.btn-gray:hover,
.btn-hero-secondary:hover {
    background: var(--green-soft);
    border-color: #bfd4ff;
    color: var(--green);
}

.btn-danger,
.delete-row-btn {
    background: var(--danger);
    border-color: var(--danger);
    color: #fff;
}

.btn-warning {
    background: var(--gold-soft);
    border-color: #ffd992;
    color: #8a5200;
}

.badge {
    border-radius: 999px;
    padding: 4px 9px;
    font-weight: 750;
    letter-spacing: 0;
    text-transform: none;
}

input[type="file"] {
    border: 1px dashed #b9c7da;
    border-radius: var(--radius);
    padding: 14px;
}

.payment-card,
.payment-box,
.contact-info-card,
.feature-card,
.pricing-card,
.about-stat,
.student-card {
    border-radius: var(--radius);
    border: 1px solid var(--border-soft);
    box-shadow: 0 14px 38px var(--shadow-soft);
}

.link-back {
    color: var(--green);
    font-weight: 750;
}

@media (max-width: 600px) {
    .container {
        border-radius: 0;
        margin: 0;
        min-height: calc(100svh - 88px);
        padding: 24px 18px;
    }

    .btn,
    button,
    input,
    select,
    textarea {
        min-height: 44px;
    }

    .flex-between,
    .question-card-head,
    .option-row {
        align-items: stretch;
        flex-direction: column;
    }

    .question-actions {
        width: 100%;
    }

    .question-actions .btn,
    .option-row .btn {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}