/* ============================================
   Fitwea — Theme System (Light / Dark)
   ============================================ */

:root,
[data-theme="light"] {
    --bg-primary: #f9fafb;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-input: #ffffff;
    --bg-accent: #eef2ff;
    --bg-hover: #f1f5f9;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #6b7280;
    --text-light: #9ca3af;

    --border-color: #e5e7eb;
    --border-light: #f0f2f5;

    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #eef2ff;

    --danger: #ef4444;
    --danger-light: #fef2f2;
    --success: #22c55e;
    --warning: #f59e0b;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 1px 3px rgba(0,0,0,0.1);

    --ring-cal: #f97316;
    --ring-prot: #10b981;
    --ring-fat: #f59e0b;
    --ring-carbs: #3b82f6;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --bg-input: #334155;
    --bg-accent: #1e3a5f;
    --bg-hover: #334155;

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-light: #475569;

    --border-color: #334155;
    --border-light: #1e293b;

    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --accent-light: #1e3a5f;

    --danger: #f87171;
    --danger-light: #3b1a1a;
    --success: #4ade80;
    --warning: #fbbf24;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 1px 3px rgba(0,0,0,0.4);

    --ring-cal: #fb923c;
    --ring-prot: #34d399;
    --ring-fat: #fbbf24;
    --ring-carbs: #60a5fa;
}

/* Base styles */
html {
    font-size: 14px;
    position: relative;
    min-height: 100%;
}

@media (min-width: 768px) {
    html { font-size: 16px; }
}

body {
    margin: 0;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    transition: background-color 0.2s, color 0.2s;
}

/* Navbar */
.top-navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(8px);
    transition: background-color 0.2s;
}

.nav-inner {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
}

.nav-brand {
    font-size: 18px;
    font-weight: 700;
    color: var(--accent);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-brand:hover {
    color: var(--accent-hover);
}

.nav-controls {
    display: flex;
    gap: 8px;
    align-items: center;
}

.theme-btn {
    background: var(--bg-hover);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 6px;
    transition: all 0.15s;
    color: var(--text-secondary);
}

.theme-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

[data-theme="light"] .moon-icon,
[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon,
[data-theme="light"] .sun-icon {
    display: none;
}

.theme-btn svg {
    stroke: currentColor;
    stroke-width: 1.8;
    fill: none;
}

/* App container */
.app-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 8px 12px 80px;
}

.app-footer {
    position: fixed;
    bottom: 0;
    width: 100%;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    text-align: center;
    padding: 8px 0;
    font-size: 11px;
    color: var(--text-light);
    transition: background-color 0.2s;
}

/* Bootstrap overrides */
.btn {
    border-radius: 12px;
}

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

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

.form-control {
    background: var(--bg-input);
    border-color: var(--border-color);
    color: var(--text-primary);
    border-radius: 14px;
}

.form-control:focus {
    background: var(--bg-input);
    border-color: var(--accent);
    box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem var(--accent);
    color: var(--text-primary);
}

/* Loading spinner */
.spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}

.spinner-overlay.visible {
    opacity: 1;
    pointer-events: all;
}

.spinner-box {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 24px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    box-shadow: var(--shadow-md);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.spinner-text {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Toast notifications */
.toast-container {
    position: fixed;
    bottom: 56px;
    left: 16px;
    right: 16px;
    display: flex;
    flex-direction: column-reverse;
    gap: 6px;
    z-index: 9998;
    pointer-events: none;
}

.toast-message {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: 40px;
    font-size: 13px;
    font-weight: 500;
    pointer-events: auto;
    animation: toastIn 0.25s ease;
    max-width: fit-content;
    box-shadow: var(--shadow-md);
}

.toast-message.success {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.toast-message.error {
    background: var(--danger-light);
    color: var(--danger);
    border: 1px solid var(--danger);
}

@keyframes toastIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}