/* =========================================================
   PostCraft — Styles
   ========================================================= */

:root {
    --color-bg: #f0f2f5;
    --color-surface: #ffffff;
    --color-text: #1a1a2e;
    --color-text-secondary: #64748b;
    --color-border: #e2e8f0;
    --color-primary: #5B5FC7;
    --color-primary-hover: #4a4eb3;
    --color-danger: #ef4444;
    --color-success: #22c55e;
    --color-warning: #eab308;

    --color-linkedin: #0A66C2;
    --color-instagram: #E1306C;
    --color-twitter: #1DA1F2;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', 'Consolas', monospace;

    --platform-accent: var(--color-linkedin);
}

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

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ---- App Shell ---- */
.app {
    max-width: 1280px;
    margin: 0 auto;
    padding: 1.25rem 1.5rem 2rem;
}

/* ---- Header ---- */
.app-header {
    text-align: center;
    margin-bottom: 0.85rem;
}

.app-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.app-header .accent {
    color: var(--platform-accent);
    transition: color 0.3s ease;
}

.tagline {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    margin-top: 0.2rem;
}

/* ---- Platform Tabs ---- */
.platform-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.85rem;
    justify-content: center;
    flex-wrap: wrap;
}

.tab {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: 999px;
    background: var(--color-surface);
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

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

.tab.active {
    border-color: var(--platform-accent);
    background: var(--platform-accent);
    color: #fff;
}

.tab-icon {
    font-weight: 800;
    font-size: 0.8rem;
}

/* ---- Main Layout — Side by Side ---- */
.main-layout {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 1rem;
    align-items: stretch;
    min-height: calc(100vh - 180px);
}

/* ---- Editor Card ---- */
.editor-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
}

/* ---- Toolbar ---- */
.toolbar {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 0.6rem;
    border-bottom: 1px solid var(--color-border);
    background: #fafbfc;
    flex-wrap: wrap;
}

.toolbar-group {
    display: flex;
    gap: 2px;
}

.toolbar-sep {
    width: 1px;
    height: 24px;
    background: var(--color-border);
    margin: 0 0.3rem;
    flex-shrink: 0;
}

.tool-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    padding: 0 0.35rem;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-text);
    font-size: 0.82rem;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all 0.15s ease;
    user-select: none;
    white-space: nowrap;
    position: relative;
}

.tool-btn:hover {
    background: #eef0f4;
    border-color: var(--color-border);
}

.tool-btn:active {
    background: #dde0e6;
    transform: scale(0.96);
}

.tool-btn-danger:hover {
    background: #fef2f2;
    color: var(--color-danger);
    border-color: #fecaca;
}

.toggle-chars-btn.active {
    background: var(--platform-accent);
    color: #fff;
    border-color: var(--platform-accent);
}

.underline-label { text-decoration: underline; }
.strike-label { text-decoration: line-through; }

/* ---- Shortcut Help & Undo Buttons ---- */
.shortcut-help-btn {
    font-size: 1.05rem !important;
    opacity: 0.65;
}
.shortcut-help-btn:hover { opacity: 1; }

.tool-btn-undo { font-size: 1rem !important; }
.tool-btn-undo:disabled { opacity: 0.3; cursor: default; }
.tool-btn-undo:disabled:hover { background: transparent; border-color: transparent; }

/* ---- Custom Tooltip ---- */
.tool-btn .btn-tooltip {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-text);
    color: #fff;
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.4rem 0.7rem;
    border-radius: 5px;
    white-space: nowrap;
    pointer-events: none;
    z-index: 100;
    line-height: 1.4;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.18);
}

.tool-btn .btn-tooltip::after {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-bottom-color: var(--color-text);
}

.tool-btn .btn-tooltip .shortcut-hint {
    display: block;
    opacity: 0.85;
    font-size: 0.75rem;
    margin-top: 2px;
    font-family: var(--font-mono);
    letter-spacing: 0.03em;
}

.tool-btn:hover .btn-tooltip {
    display: block;
}

/* ---- Special Characters Panel ---- */
.special-chars-panel {
    padding: 0.6rem;
    border-bottom: 1px solid var(--color-border);
    background: #fafbfc;
    max-height: 180px;
    overflow-y: auto;
}

.chars-category { margin-bottom: 0.5rem; }
.chars-category:last-child { margin-bottom: 0; }

.chars-category-label {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-secondary);
    margin-bottom: 0.25rem;
}

.chars-row { display: flex; flex-wrap: wrap; gap: 3px; }

.char-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 30px;
    height: 28px;
    padding: 0 0.25rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.15s ease;
}

.char-btn:hover {
    background: var(--platform-accent);
    color: #fff;
    border-color: var(--platform-accent);
}

.char-btn.divider-char {
    font-size: 0.65rem;
    letter-spacing: -0.5px;
    min-width: auto;
    padding: 0 0.4rem;
}

/* ---- Editor Textarea ---- */
.editor-textarea {
    display: block;
    width: 100%;
    min-height: 200px;
    flex: 1;
    padding: 0.85rem 1rem;
    border: none;
    outline: none;
    resize: vertical;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-surface);
}

.editor-textarea::placeholder { color: #b0b8c4; }

.editor-textarea:focus {
    box-shadow: inset 0 0 0 2px rgba(91, 95, 199, 0.15);
}

/* ---- Status Bar ---- */
.status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    border-top: 1px solid var(--color-border);
    background: #fafbfc;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.char-counter {
    font-size: 0.78rem;
    color: var(--color-text-secondary);
    font-variant-numeric: tabular-nums;
}

.char-counter.over-limit { color: var(--color-danger); font-weight: 600; }
.char-counter.near-limit { color: var(--color-warning); font-weight: 600; }

.twitter-weighted-count { font-size: 0.78rem; color: var(--color-text-secondary); }

.status-actions { display: flex; gap: 0.4rem; }

.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.4rem 0.85rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
    user-select: none;
}

.btn-primary {
    background: var(--platform-accent);
    color: #fff;
    transition: background 0.3s ease;
}

.btn-primary:hover { filter: brightness(0.9); }
.btn-primary:active { transform: scale(0.97); }

.btn-secondary {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: #f1f3f5;
    color: var(--color-text);
}

/* ---- Preview Panel ---- */
.preview-panel {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.65rem 0.85rem;
    border-bottom: 1px solid var(--color-border);
    background: #fafbfc;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.preview-title {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-text);
}

.preview-platform-badge {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    background: var(--platform-accent);
    color: #fff;
    transition: background 0.3s ease;
}

.preview-body {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    min-height: 0;
}

.preview-content {
    font-family: var(--font-sans);
    font-size: 0.92rem;
    line-height: 1.65;
    color: var(--color-text);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.preview-placeholder {
    color: #b0b8c4;
    font-style: italic;
}

/* Platform-specific preview styles */
.preview-body.linkedin-preview .preview-content {
    font-size: 0.92rem;
    line-height: 1.5;
}

.preview-body.instagram-preview .preview-content {
    font-size: 0.88rem;
    line-height: 1.55;
}

.preview-body.twitter-preview .preview-content {
    font-size: 0.95rem;
    line-height: 1.45;
}

/* ---- Preview Warnings ---- */
.preview-warnings {
    padding: 0.55rem 0.85rem;
    border-top: 1px solid var(--color-border);
    background: #fffbeb;
    flex-direction: column;
    gap: 0.25rem;
    display: none;
}

.preview-warnings.visible {
    display: flex;
}

.preview-warning-item {
    font-size: 0.75rem;
    color: #92400e;
    display: flex;
    align-items: flex-start;
    gap: 0.35rem;
}

.preview-warning-item::before {
    content: '⚠';
    flex-shrink: 0;
}

/* ---- Platform Tips (inside preview footer) ---- */
.preview-footer {
    border-top: 1px solid var(--color-border);
}

.platform-tips {
    padding: 0.6rem 0.85rem;
}

.tips-heading {
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.tips-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.tips-list li {
    font-size: 0.78rem;
    color: var(--color-text-secondary);
    padding-left: 1rem;
    position: relative;
    line-height: 1.45;
}

.tips-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--platform-accent);
    transition: color 0.3s ease;
}

/* ---- Footer ---- */
.app-footer {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

/* ---- Shortcut Modal ---- */
.shortcut-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(3px);
}

.shortcut-overlay.visible { display: flex; }

.shortcut-modal {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    width: min(640px, 92vw);
    max-height: 85vh;
    overflow-y: auto;
}

.shortcut-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
}

.shortcut-modal-header h3 { font-size: 1rem; font-weight: 600; }

.shortcut-close {
    background: none;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--color-text-secondary);
    padding: 0 0.25rem;
    line-height: 1;
}
.shortcut-close:hover { color: var(--color-text); }

.shortcut-modal-body {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(175px, 1fr));
    gap: 1.25rem;
    padding: 1.25rem;
}

.shortcut-modal-body h4 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    margin-bottom: 0.6rem;
}

.shortcut-list { display: flex; flex-direction: column; gap: 0.35rem; }

.shortcut-list > div {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.shortcut-list dt {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    background: #f1f3f5;
    padding: 0.2rem 0.45rem;
    border-radius: 4px;
    border: 1px solid var(--color-border);
    white-space: nowrap;
    color: var(--color-text);
}

.shortcut-list dd { font-size: 0.8rem; color: var(--color-text-secondary); }

.shortcut-footnote {
    padding: 0.75rem 1.25rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    text-align: center;
}

.shortcut-footnote kbd {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    background: #f1f3f5;
    padding: 0.1rem 0.35rem;
    border-radius: 3px;
    border: 1px solid var(--color-border);
}

/* ---- Toast ---- */
.toast {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%) translateY(120%);
    padding: 0.65rem 1.25rem;
    background: var(--color-text);
    color: #fff;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    box-shadow: var(--shadow-md);
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
    z-index: 1000;
    white-space: nowrap;
}

.toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ---- Responsive ---- */
@media (max-width: 860px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
    .preview-panel {
        position: static;
        max-height: none;
    }
    .preview-body { min-height: 200px; }
}

@media (max-width: 600px) {
    .app { padding: 1rem 0.75rem 1.5rem; }
    .app-header h1 { font-size: 1.4rem; }
    .editor-textarea { min-height: 250px; font-size: 0.9rem; }
    .toolbar { padding: 0.4rem 0.5rem; gap: 0.15rem; }
    .tool-btn { min-width: 28px; height: 28px; font-size: 0.78rem; }
    .toolbar-sep { margin: 0 0.15rem; }
    .status-bar { flex-direction: column; align-items: stretch; }
    .status-actions { justify-content: flex-end; }
    .copy-label { display: none; }
    .btn-primary::after { content: 'Copy'; }
}