/* ===== Reset & Base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #059669;
    --primary-dark: #047857;
    --primary-light: #d1fae5;
    --bg: #f8fafc;
    --text: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --card: #ffffff;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --radius: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== Header v2 (dark brand bar) ===== */
.site-header {
    background: #064e3b;
    border-bottom: 3px solid #059669;
    padding: 14px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}
.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.site-logo {
    font-size: 21px;
    font-weight: 800;
    letter-spacing: -0.3px;
    color: #ffffff;
    text-decoration: none;
}
.site-logo span { color: #6ee7b7; }
.site-nav {
    display: flex;
    align-items: center;
    gap: 12px;
}
.tools-menu-wrap { position: relative; display: inline-block; }
.tools-menu-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255,255,255,0.12);
    color: #ffffff;
    border: 1px solid rgba(255,255,255,0.28);
    border-radius: 6px;
    padding: 7px 13px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s;
}
.tools-menu-btn:hover { background: rgba(255,255,255,0.22); }
.tools-menu-btn svg:last-child { opacity: 0.7; }
.tools-menu {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    background: #ffffff;
    border-radius: 10px;
    box-shadow: 0 10px 34px rgba(0,0,0,0.18);
    min-width: 250px;
    padding: 8px;
    z-index: 200;
}
.tools-menu-title {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: #94a3b8;
    padding: 6px 10px 8px;
    font-weight: 600;
}
.tools-menu a {
    display: flex;
    align-items: center;
    gap: 9px;
    padding: 9px 10px;
    border-radius: 6px;
    color: #1e293b;
    text-decoration: none;
    font-size: 14px;
}
.tools-menu a:hover { background: #d1fae5; color: #065f46; }
.tools-menu a svg { color: #059669; flex-shrink: 0; }
.lang-switcher {
    margin-left: 4px;
    padding: 6px 10px;
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 6px;
    background: rgba(255,255,255,0.12);
    color: #ffffff;
    font-size: 13px;
    cursor: pointer;
}
.lang-switcher option { color: #1e293b; }

/* ===== Page Header ===== */
.page-header {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    color: white;
    padding: 40px 0;
    text-align: center;
}
.page-header h1 { font-size: 32px; margin-bottom: 8px; }
.page-header p { opacity: 0.9; font-size: 16px; }

/* ===== Layout ===== */
.calculator-page { padding: 40px 0; }
.calculator-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

/* ===== Card ===== */
.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--radius);
    border: none;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: all 0.2s;
}
.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary {
    background: white;
    color: var(--text);
    border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--bg); }
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===== Upload Area ===== */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: #fafafa;
}
.upload-area:hover, .upload-area.dragover {
    border-color: var(--primary);
    background: var(--primary-light);
}
.upload-area h3 { margin-bottom: 8px; color: var(--text); }
.upload-area p { color: var(--text-secondary); font-size: 14px; }

/* ===== Toolbar ===== */
.toolbar {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 20px;
    padding: 16px;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.toolbar label {
    font-size: 14px;
    color: var(--text-secondary);
    margin-right: 8px;
}
.toolbar select, .toolbar input[type="number"] {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
}

/* ===== PDF Preview ===== */
.pdf-preview-container {
    background: #e5e7eb;
    border-radius: var(--radius);
    padding: 20px;
    overflow: auto;
    text-align: center;
}
.pdf-page-wrapper {
    display: inline-block;
    position: relative;
    margin: 0 auto 20px;
    background: white;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.pdf-page-wrapper canvas {
    display: block;
}

/* ===== Split Lines ===== */
.split-line {
    position: absolute;
    background: #ef4444;
    cursor: move;
    z-index: 10;
}
.split-line.horizontal {
    left: 0;
    right: 0;
    height: 3px;
    cursor: row-resize;
}
.split-line.vertical {
    top: 0;
    bottom: 0;
    width: 3px;
    cursor: col-resize;
}
.split-line::after {
    content: '';
    position: absolute;
    width: 12px;
    height: 12px;
    background: #ef4444;
    border: 2px solid white;
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* ===== Result Area ===== */
.result-area {
    margin-top: 24px;
    padding: 20px;
    background: var(--primary-light);
    border-radius: var(--radius);
    text-align: center;
}

/* ===== Footer v2 (dark) ===== */
.site-footer {
    background: #0f172a;
    padding: 32px 0;
    margin-top: 60px;
    text-align: center;
    color: #94a3b8;
    font-size: 14px;
}
.footer-nav {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 12px;
}
.footer-nav a {
    color: #cbd5e1;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.15s;
}
.footer-nav a:hover { color: #6ee7b7; }
.footer-note {
    font-size: 12px;
    opacity: 0.7;
    margin-top: 6px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .page-header h1 { font-size: 24px; }
    .page-header p { font-size: 14px; }
    .toolbar { flex-direction: column; align-items: stretch; }
}

/* ===== Toolbar UX (splitter v2) ===== */
.btn-link {
    background: none;
    border: none;
    color: var(--primary);
    font-size: 13px;
    cursor: pointer;
    padding: 4px 2px;
    text-decoration: underline;
}
.btn-link:hover { color: var(--primary-dark); }
.view-toggle {
    background: white;
    border: none;
    padding: 6px 14px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}
.view-toggle.active {
    background: var(--primary);
    color: white;
    font-weight: 600;
}
.pdf-page-wrapper.single-mode {
    display: block;
    margin: 0 auto;
}
#previewNav .btn {
    padding: 8px 16px;
    font-size: 13px;
}
@media (max-width: 640px) {
    .toolbar { justify-content: flex-start; }
    .view-toggle { padding: 8px 12px; }
    .tools-menu-btn { padding: 10px 14px; min-height: 44px; }
    .lang-switcher { padding: 10px 8px; min-height: 44px; }
    .footer-nav { gap: 16px; }
    .footer-nav a { padding: 10px 4px; }
    .site-logo { padding: 6px 0; }
}

.view-toggle:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: #f1f5f9;
    color: #94a3b8;
}
#previewNav .btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-outline {
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn-outline:hover { background: var(--primary-light); }
.btn-outline:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}