@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@400;500;600&family=Space+Grotesk:wght@300;400;500;600&family=Bricolage+Grotesque:wght@300;400;500;600;700&display=swap');

.font-oswald { font-family: 'Oswald', sans-serif; }
.font-space { font-family: 'Space Grotesk', sans-serif; }
.font-bricolage { font-family: 'Bricolage Grotesque', sans-serif; }

:root {
    /* Dark Mode (Default) */
    --bg-primary: #050505;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #171717;
    --bg-card: rgba(23, 23, 23, 0.6);
    --text-primary: #f5f5f5;
    --text-secondary: #a3a3a3;
    --text-muted: #525252;
    --border-color: #262626;
    --accent: #10b981;
    --accent-hover: #34d399;
    --nav-bg: rgba(0, 0, 0, 0.6);
    --nav-border: rgba(255, 255, 255, 0.08);
}

[data-theme="light"] {
    /* Enhanced Light Mode (High Contrast) */
    --bg-primary: #f4f4f5; /* Zinc-100 */
    --bg-secondary: #ffffff;
    --bg-tertiary: #e4e4e7; /* Zinc-200 */
    --bg-card: #ffffff;
    --text-primary: #09090b; /* Zinc-950 */
    --text-secondary: #3f3f46; /* Zinc-700 */
    --text-muted: #52525b; /* Zinc-600 */
    --border-color: #d4d4d8; /* Zinc-300 */
    --accent: #059669; /* Emerald-600 */
    --accent-hover: #10b981; /* Emerald-500 */
    --nav-bg: rgba(255, 255, 255, 0.9);
    --nav-border: rgba(0, 0, 0, 0.08);
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* Animations */
.animate-on-scroll { opacity: 0.01; filter: blur(12px); transition: opacity 0.8s, transform 0.8s, filter 0.8s; }
.animate-up { opacity: 1; transform: translateY(0); filter: blur(0); }
.animate-init-up { transform: translateY(30px); }

/* Nav */
.liquid-glass {
    background: var(--nav-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--nav-border);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
}

/* Theme Classes */
.bg-theme-primary { background-color: var(--bg-primary); }
.bg-theme-secondary { background-color: var(--bg-secondary); }
.bg-theme-tertiary { background-color: var(--bg-tertiary); }
.bg-theme-card { background-color: var(--bg-card); }
.text-theme-primary { color: var(--text-primary); }
.text-theme-secondary { color: var(--text-secondary); }
.text-theme-muted { color: var(--text-muted); }
.border-theme { border-color: var(--border-color); }
.text-accent { color: var(--accent); }

/* Logo */
.logo-mark { fill: currentColor; }
[data-theme="dark"] .logo-mark { color: #ffffff; }
[data-theme="light"] .logo-mark { color: #000000; }

/* Toggle */
.theme-toggle {
    position: relative;
    width: 44px;
    height: 24px;
    border-radius: 9999px;
    background: var(--border-color);
    cursor: pointer;
    transition: background 0.3s ease;
}
.theme-toggle::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    border-radius: 9999px;
    background: var(--text-primary);
    transition: transform 0.3s ease, background 0.3s ease;
}
[data-theme="light"] .theme-toggle::after {
    transform: translateX(20px);
}

/* Mobile Menu */
.mobile-menu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}
.mobile-menu.open {
    max-height: 400px;
}

/* Interactive Elements */
.btn-primary {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 10px 20px -10px var(--accent);
}
.btn-primary:active {
    transform: translateY(0) scale(0.98);
}

/* Slider styles */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    transition: background 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--accent-hover);
}

/* Form inputs */
.calc-input {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: border-color 0.2s ease;
}

.calc-input:focus {
    outline: none;
    border-color: var(--accent);
}

select.calc-input {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a3a3a3' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
    -webkit-appearance: none;
    appearance: none;
}