/* Language Learning Anki Card Assistant — ElevenLabs-inspired UI */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ==================== Theme Variables ==================== */

:root {
    --bg:             #0A0A0A;
    --bg-secondary:   #111111;
    --surface:        #1A1A1A;
    --surface-raised: #242424;
    --border:         rgba(255,255,255,0.07);
    --border-strong:  rgba(255,255,255,0.12);
    --text:           #F5F5F5;
    --text-heading:   #FFFFFF;
    --text-label:     #A3A3A3;
    --text-muted:     #737373;
    --text-dim:       #525252;
    --text-body:      #D4D4D4;
    /* primary action = white pill on dark bg */
    --accent:         #FFFFFF;
    --accent-hover:   #E5E5E5;
    --accent-soft:    rgba(255,255,255,0.06);
    --accent-border:  rgba(255,255,255,0.15);
    --accent-text:    #0A0A0A;
    --tab-nav-bg:     #1A1A1A;
    --input-bg:       #1A1A1A;
    --select-opt-bg:  #242424;
    --empty-text:     #525252;
    --shadow:         rgba(0,0,0,0.5);
    --success:        #22C55E;
    --warning:        #EAB308;
    --danger:         #EF4444;
    --loading-bg:     rgba(10,10,10,0.88);
}

[data-theme="light"] {
    --bg:             #FAFAFA;
    --bg-secondary:   #F5F5F5;
    --surface:        #FFFFFF;
    --surface-raised: #F5F5F5;
    --border:         rgba(0,0,0,0.08);
    --border-strong:  rgba(0,0,0,0.13);
    --text:           #171717;
    --text-heading:   #0A0A0A;
    --text-label:     #525252;
    --text-muted:     #737373;
    --text-dim:       #A3A3A3;
    --text-body:      #404040;
    /* primary action = black pill on light bg */
    --accent:         #0A0A0A;
    --accent-hover:   #262626;
    --accent-soft:    rgba(0,0,0,0.05);
    --accent-border:  rgba(0,0,0,0.15);
    --accent-text:    #FFFFFF;
    --tab-nav-bg:     #F5F5F5;
    --input-bg:       #FFFFFF;
    --select-opt-bg:  #FFFFFF;
    --empty-text:     #A3A3A3;
    --shadow:         rgba(0,0,0,0.08);
    --loading-bg:     rgba(250,250,250,0.92);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    min-height: 100vh;
    color: var(--text);
    overflow-x: hidden;
    transition: background 0.2s, color 0.2s;
    font-size: 0.9375rem;
    line-height: 1.5;
}

/* ==================== Layout ==================== */

.container {
    max-width: 680px;
    margin: 0 auto;
    padding: 24px 20px 48px;
}

.main-content {
    display: flex;
    flex-direction: column;
    align-items: stretch;
}

/* ==================== Header ==================== */

.header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 28px;
    gap: 16px;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.header-bottom-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-text { text-align: center; }

.header h1 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-heading);
    letter-spacing: -0.01em;
}

.header p {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-top: 2px;
}

.header-logo-icon { display: none; }

/* ==================== Tab Nav ==================== */

.tab-nav {
    display: flex;
    gap: 2px;
    background: var(--tab-nav-bg);
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    padding: 3px;
    width: fit-content;
}

.header-tab-nav { margin-bottom: 0 !important; }

.tab-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 7px 14px;
    border-radius: 7px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.15s, background 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    flex: 1;
    font-family: inherit;
    white-space: nowrap;
}

.tab-btn:hover { color: var(--text); }

.tab-btn.active {
    background: var(--surface-raised);
    color: var(--text);
    border: 1px solid var(--border-strong);
    font-weight: 600;
}

.header-tab-nav .tab-btn { font-size: 0.78rem; padding: 6px 12px; }
.header-tab-nav .tab-btn i { font-size: 0.7rem; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ==================== Lang + Theme Controls ==================== */

.ui-lang-toggle {
    margin-bottom: 0 !important;
}

.ui-lang-toggle .tab-btn {
    font-size: 0.75rem;
    padding: 6px 11px;
}

.theme-toggle-btn {
    background: var(--tab-nav-bg);
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    color: var(--text-muted);
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.theme-toggle-btn:hover { color: var(--text); border-color: var(--border-strong); }

/* ==================== Glass Panel (shared) — now flat ==================== */

.input-section,
.card-section,
.stats-section {
    background: var(--surface);
    border-radius: 12px;
    padding: 28px 28px;
    border: 1px solid var(--border-strong);
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
}

/* ==================== Form ==================== */

.form-container h2 {
    color: var(--text-heading);
    margin-bottom: 24px;
    font-size: 1.1rem;
    font-weight: 600;
}

.form-group { margin-bottom: 20px; }

.form-group-row {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 20px;
}

.form-group-half {
    flex: 1;
    margin-bottom: 0;
    min-width: 0;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text-label);
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-group label i {
    margin-right: 6px;
    color: var(--text-label);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 14px;
    background: var(--input-bg);
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    font-size: 0.9375rem;
    color: var(--text);
    transition: border-color 0.15s, box-shadow 0.15s;
    font-family: inherit;
    -webkit-appearance: none;
    appearance: none;
}

.form-group select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23737373' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-dim);
}

.form-group textarea {
    resize: vertical;
    min-height: 96px;
    line-height: 1.6;
}

.form-group select option {
    background: var(--select-opt-bg);
    color: var(--text);
}

/* ==================== Buttons ==================== */

.btn {
    padding: 10px 22px;
    border: 1px solid transparent;
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, opacity 0.15s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    text-decoration: none;
    font-family: inherit;
    white-space: nowrap;
    letter-spacing: -0.01em;
}

.btn i { font-size: 0.875rem; }

/* Primary: filled pill (white on dark / black on light) */
.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--accent-text);
    font-weight: 600;
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

/* Secondary: ghost pill */
.btn-secondary {
    background: transparent;
    border-color: var(--border-strong);
    color: var(--text);
}
.btn-secondary:hover { background: var(--surface-raised); }

/* Success / Warning / Info — tinted ghost pills */
.btn-success {
    background: transparent;
    border-color: rgba(34,197,94,0.30);
    color: #4ADE80;
}
.btn-success:hover { background: rgba(34,197,94,0.08); }

.btn-warning {
    background: transparent;
    border-color: rgba(234,179,8,0.30);
    color: #FDE047;
}
.btn-warning:hover { background: rgba(234,179,8,0.08); }

.btn-info {
    background: transparent;
    border-color: var(--border-strong);
    color: var(--text-label);
}
.btn-info:hover { background: var(--surface-raised); color: var(--text); }

.btn-outline {
    background: transparent;
    border-color: var(--border-strong);
    color: var(--text-label);
}
.btn-outline:hover { background: var(--surface-raised); color: var(--text); }

.btn-small   { padding: 5px 14px;  font-size: 0.8rem; }
.btn-compact { padding: 4px 12px;  font-size: 0.8rem; }
.btn-compact i { font-size: 0.8rem; }

.form-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 24px;
    width: 100%;
}

.form-actions .btn { flex: 1; min-width: 0; }

/* ==================== Image Upload ==================== */

.image-upload-container { position: relative; }

.image-input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.image-upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 18px 12px;
    border: 1px dashed var(--border-strong);
    border-radius: 8px;
    background: transparent;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    text-align: center;
    min-height: 76px;
}

.image-upload-label:hover {
    border-color: var(--border-strong);
    background: var(--surface-raised);
}

.image-upload-label i { font-size: 1.3rem; color: var(--text-label); margin-bottom: 6px; }
.image-upload-label span { color: var(--text-muted); font-weight: 500; font-size: 0.8rem; }

.image-preview { margin-top: 12px; text-align: center; }
.image-preview img {
    max-width: 180px;
    max-height: 135px;
    border-radius: 8px;
    border: 1px solid var(--border-strong);
}

/* ==================== Audio Recording ==================== */

.audio-input-group {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
}

.audio-button-group {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.btn-recording {
    background: rgba(239,68,68,0.10);
    border: 1px solid rgba(239,68,68,0.22);
    color: #F87171;
    padding: 9px 18px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s;
    font-size: 0.875rem;
    white-space: nowrap;
    font-family: inherit;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 7px;
}

.btn-recording:hover { background: rgba(239,68,68,0.18); }
.btn-record i { font-size: 1rem; }

.btn-stop {
    background: rgba(234,179,8,0.10);
    border-color: rgba(234,179,8,0.22);
    color: #FDE047;
}

.btn-stop:hover { background: rgba(234,179,8,0.18); }

.btn-pokeball {
    padding: 0 !important;
    width: 46px !important;
    height: 46px !important;
    border-radius: 50% !important;
    background: transparent !important;
    border: none !important;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    min-width: 46px !important;
    max-width: 46px !important;
}

.btn-pokeball:hover { transform: scale(1.08); }
.pokeball-icon { width: 100%; height: 100%; object-fit: contain; }

.form-group .audio-filename-input {
    height: 46px !important;
    width: 140px !important;
    padding: 0 10px !important;
    margin-left: 8px !important;
    min-width: 0;
    font-size: 0.78rem !important;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.recording-status {
    font-size: 0.85rem;
    font-weight: 500;
    margin-left: 8px;
    color: var(--text-muted);
}

.recording-status.recording {
    color: #EF4444;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.5; }
}

/* ==================== Card Section ==================== */

.card-container h2 {
    color: var(--text-heading);
    margin-bottom: 20px;
    font-size: 1.05rem;
    font-weight: 600;
}

.learning-card {
    background: var(--bg-secondary);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--border-strong);
    border-left: 2px solid var(--border-strong);
}

.card-field { margin-bottom: 18px; }
.card-field:last-child { margin-bottom: 0; }

.card-field-label {
    font-weight: 500;
    color: var(--text-label);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 7px;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.card-field-label i { color: var(--text-label); }

.card-field-content {
    background: var(--surface);
    padding: 12px 14px;
    border-radius: 8px;
    border: 1px solid var(--border);
    line-height: 1.6;
    white-space: pre-wrap;
    color: var(--text);
    font-size: 0.9375rem;
}

.editable-field {
    background: var(--surface);
    padding: 12px 14px;
    border-radius: 8px;
    border: 1px solid var(--border-strong);
    line-height: 1.6;
    font-family: inherit;
    font-size: 0.9375rem;
    color: var(--text);
    resize: vertical;
    min-height: 38px;
    width: 100%;
    box-sizing: border-box;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.editable-field:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.editable-field:disabled { opacity: 0.4; cursor: not-allowed; }

.explanation-wrapper {
    display: flex !important;
    flex-direction: column !important;
    gap: 16px;
    margin-top: 6px;
    width: 100%;
}

.explanation-content {
    display: flex;
    flex-direction: column;
    width: 100%;
    flex: 0 0 auto;
}

.explanation-customize {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
    flex: 0 0 auto;
}

.customize-label {
    font-weight: 500;
    color: var(--text-label);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    display: flex;
    align-items: center;
    gap: 7px;
    margin-bottom: 2px;
}

.customize-label i { color: var(--text-label); }

.customize-input {
    background: var(--surface);
    padding: 10px 14px;
    border-radius: 8px;
    border: 1px solid var(--border-strong);
    line-height: 1.5;
    font-family: inherit;
    font-size: 0.875rem;
    color: var(--text);
    resize: vertical;
    width: 100%;
    box-sizing: border-box;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.customize-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.customize-input::placeholder { color: var(--text-dim); }
.card-field-content img { max-width: 100%; height: auto; border-radius: 8px; margin-top: 10px; }
.card-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ==================== Statistics Section ==================== */

.stats-section.stats-compact {
    padding: 12px 18px;
    margin-top: 16px;
    margin-bottom: 0;
}

.stats-container.stats-horizontal {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.stats-left { display: flex; flex-direction: column; gap: 4px; }

.stat-item-inline {
    display: flex;
    align-items: center;
    gap: 8px;
}

.stat-item-inline .stat-label { color: var(--text-muted); font-size: 0.82rem; font-weight: 400; }
.stat-item-inline .stat-number { color: var(--text); font-size: 0.9rem; font-weight: 600; }

.stats-right { display: flex; gap: 7px; flex-wrap: wrap; }

.stats-container h3 { color: var(--text-heading); margin-bottom: 20px; font-size: 1.05rem; font-weight: 600; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.stat-item {
    text-align: center;
    padding: 18px;
    background: var(--surface-raised);
    border-radius: 10px;
    border: 1px solid var(--border);
}

.stat-number { display: block; font-size: 2rem; font-weight: 700; color: var(--text-heading); margin-bottom: 4px; }
#lastExport { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.stat-label { font-size: 0.85rem; color: var(--text-muted); }
.action-buttons { display: flex; gap: 10px; flex-wrap: wrap; }

/* ==================== My Cards Tab ==================== */

.cards-list-container { padding: 2px 0; }

.cards-empty {
    text-align: center;
    color: var(--empty-text);
    padding: 56px 0;
    font-size: 0.9rem;
}

.cards-table-wrap {
    overflow-x: auto;
    border-radius: 10px;
    border: 1px solid var(--border-strong);
}

.cards-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.84rem;
    table-layout: fixed;
}

.cards-table thead tr { background: var(--surface-raised); }

.cards-table th {
    padding: 10px 13px;
    text-align: left;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-label);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-bottom: 1px solid var(--border-strong);
    white-space: nowrap;
}

.cards-table td {
    padding: 11px 13px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
    color: var(--text-body);
}

.cards-table tbody tr:last-child td { border-bottom: none; }
.cards-table tbody tr:hover td { background: var(--surface-raised); }

.cards-table th:nth-child(1), .cards-table td.ct-expression  { width: 16%; }
.cards-table th:nth-child(2), .cards-table td.ct-translation { width: 14%; }
.cards-table th:nth-child(3), .cards-table td.ct-context     { width: 28%; }
.cards-table th:nth-child(4), .cards-table td.ct-explanation { width: 42%; }

.ct-expression  { font-weight: 600; color: var(--text) !important; word-break: break-word; }
.ct-translation { color: var(--text-muted) !important; word-break: break-word; }
.ct-lang        { color: var(--text-label) !important; font-size: 0.76rem; white-space: nowrap; }
.ct-date        { color: var(--text-dim) !important; font-size: 0.76rem; white-space: nowrap; }

.ct-scroll {
    max-height: 110px;
    overflow-y: auto;
    white-space: pre-wrap;
    word-break: break-word;
    line-height: 1.5;
    scrollbar-width: thin;
    scrollbar-color: var(--border-strong) transparent;
}

.ct-scroll::-webkit-scrollbar { width: 3px; }
.ct-scroll::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 2px; }

/* ==================== Guide Tab ==================== */

.guide-container { display: flex; flex-direction: column; gap: 16px; }

.guide-card {
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: 12px;
    padding: 24px 26px;
}

.guide-card h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-heading);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 9px;
}

.guide-card h2 i { color: var(--text-label); }

.guide-steps { display: flex; flex-direction: column; gap: 12px; }

.guide-step { display: flex; gap: 12px; align-items: flex-start; }

.step-num {
    width: 24px;
    height: 24px;
    min-width: 24px;
    background: var(--surface-raised);
    border: 1px solid var(--border-strong);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text);
}

.step-text {
    font-size: 0.9rem;
    color: var(--text-body);
    line-height: 1.65;
    padding-top: 2px;
}

.step-text strong { color: var(--text); font-weight: 600; }

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--accent);
    color: var(--accent-text);
    border: 1px solid var(--accent);
    padding: 10px 22px;
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s;
    margin-top: 6px;
    font-family: inherit;
    letter-spacing: -0.01em;
}

.download-btn:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

.guide-note {
    background: var(--surface-raised);
    border-left: 2px solid var(--border-strong);
    border-radius: 0 6px 6px 0;
    padding: 10px 14px;
    font-size: 0.84rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-top: 12px;
}

/* FAQ / Toggle accordion */
.faq-section-title {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 10px;
}

.faq-item {
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 7px;
}

.faq-toggle {
    width: 100%;
    background: var(--surface-raised);
    border: none;
    padding: 12px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    color: var(--text);
    font-size: 0.875rem;
    font-weight: 500;
    text-align: left;
    transition: background 0.15s;
    font-family: inherit;
}

.faq-toggle:hover { background: var(--surface); }
.faq-toggle.open  { background: var(--surface); color: var(--text); }

.faq-icon { transition: transform 0.2s; font-size: 0.7rem; opacity: 0.5; flex-shrink: 0; margin-left: 8px; }
.faq-toggle.open .faq-icon { transform: rotate(180deg); opacity: 1; }

.faq-body {
    display: none;
    padding: 13px 16px 15px;
    background: var(--surface);
    font-size: 0.855rem;
    color: var(--text-body);
    line-height: 1.7;
}

.faq-body.open { display: block; }
.faq-body .guide-steps { margin-top: 8px; }

.faq-body table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 8px;
    font-size: 0.82rem;
}

.faq-body table td {
    padding: 5px 9px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
    color: var(--text-body);
}

.faq-body table td:first-child {
    color: var(--text);
    white-space: nowrap;
    font-weight: 600;
    width: 86px;
}

.guide-step kbd {
    background: var(--surface-raised);
    border: 1px solid var(--border-strong);
    border-radius: 4px;
    padding: 1px 5px;
    font-size: 0.76rem;
    font-family: inherit;
    color: var(--text);
}

.guide-step code {
    background: var(--surface-raised);
    color: var(--text);
    border-radius: 4px;
    padding: 1px 5px;
    font-size: 0.76rem;
    font-family: 'SF Mono', 'Fira Code', monospace;
    word-break: break-all;
}

/* ==================== Guide Text Classes ==================== */

.guide-desc     { color: var(--text-body); margin-bottom: 14px; line-height: 1.65; font-size: 0.9rem; }
.guide-desc-sm  { color: var(--text-muted); margin-bottom: 14px; font-size: 0.85rem; line-height: 1.65; }
.guide-path-text{ font-size: 0.8rem; color: var(--text-muted); }

/* ==================== Loading Overlay ==================== */

.loading-overlay {
    position: fixed;
    inset: 0;
    background: var(--loading-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-content {
    text-align: center;
    color: var(--text);
    background: var(--surface);
    padding: 36px 40px;
    border-radius: 14px;
    border: 1px solid var(--border-strong);
    box-shadow: 0 24px 48px var(--shadow);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 2px solid var(--border-strong);
    border-top: 2px solid var(--text);
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
    margin: 0 auto 18px;
}

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

.loading-content h3 { margin-bottom: 8px; font-size: 1.05rem; font-weight: 600; }
.loading-content p  { color: var(--text-muted); font-size: 0.85rem; }

/* ==================== Toast Notifications ==================== */

.toast-container { position: fixed; top: 18px; right: 18px; z-index: 1001; }

.toast {
    background: var(--surface);
    border: 1px solid var(--border-strong);
    padding: 12px 18px;
    border-radius: 10px;
    box-shadow: 0 8px 24px var(--shadow);
    margin-bottom: 8px;
    border-left: 3px solid var(--success);
    animation: slideIn 0.25s ease;
    max-width: 300px;
    color: var(--text);
    font-size: 0.875rem;
}

.toast.error   { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }

@keyframes slideIn {
    from { transform: translateX(110%); opacity: 0; }
    to   { transform: translateX(0);    opacity: 1; }
}

/* ==================== Responsive ==================== */

@media (max-width: 768px) {
    .container { padding: 16px 14px 40px; }
    .header h1 { font-size: 0.95rem; }

    .form-group-row { flex-direction: column; gap: 14px; }

    .input-section,
    .card-section,
    .stats-section { max-width: 100%; padding: 18px; }

    .form-actions, .card-actions, .action-buttons { flex-direction: column; }
    .btn { width: 100%; justify-content: center; }
    .stats-grid { grid-template-columns: 1fr; }
    .explanation-wrapper { gap: 12px; }
    .stats-container.stats-horizontal { flex-direction: column; align-items: flex-start; }
    .stats-right { width: 100%; }
}

/* ==================== Utility ==================== */

.hidden  { display: none !important; }
.text-center { text-align: center; }
.mb-20   { margin-bottom: 20px; }
.mt-20   { margin-top: 20px; }