:root {
    /* ---- Brand Colors (Locked) ---- */
    --color-navy: #025292;
    --color-cyan-bright: #03DAF4;
    --color-cyan-mid: #03BDDF;
    --color-cyan-deep: #0396C4;
    --color-cyan-glow: #15E9F9;

    /* ---- Text Colors ---- */
    --text-primary: var(--color-navy);
    --text-body: #2D3E4F;
    --text-muted: #6B7A8A;

    /* ---- Background Colors ---- */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F5F7FA;

    /* ---- Border Colors ---- */
    --border-light: #DDE3EA;

    /* ---- Shadow Colors ---- */
    --shadow-cyan: 0 8px 32px rgba(3, 218, 244, 0.25);

    /* ---- Gradients ---- */
    --gradient-brand: linear-gradient(135deg, var(--color-navy) 0%, var(--color-cyan-deep) 40%, var(--color-cyan-mid) 70%, var(--color-cyan-bright) 100%);
    --gradient-cyan: linear-gradient(135deg, var(--color-cyan-deep), var(--color-cyan-bright));

    /* ---- Fonts ---- */
    --font-display: 'Bricolage Grotesque', sans-serif;
    --font-body: 'Inter', sans-serif;
}

[data-theme="dark"] {
    /* ---- Text Colors ---- */
    --text-primary: #FFFFFF;
    --text-body: #C8D4E0;
    --text-muted: #8899AA;

    /* ---- Background Colors ---- */
    --bg-primary: #081426;
    --bg-secondary: #0D1F35;

    /* ---- Border Colors ---- */
    --border-light: #1A2A3A;

    /* ---- Shadow Colors ---- */
    --shadow-cyan: 0 8px 32px rgba(3, 218, 244, 0.15);
}

/* ---- Brand Text Colors ---- */
.text-navy      { color: var(--color-navy) !important; }
.text-cyan      { color: var(--color-cyan-bright) !important; }
.text-cyan-mid  { color: var(--color-cyan-mid) !important; }
.text-cyan-deep { color: var(--color-cyan-deep) !important; }

/* ---- Brand Backgrounds ---- */
.bg-navy       { background-color: var(--color-navy) !important; }
.bg-cyan       { background-color: var(--color-cyan-bright) !important; }
.bg-cyan-mid   { background-color: var(--color-cyan-mid) !important; }
.bg-cyan-deep  { background-color: var(--color-cyan-deep) !important; }

/* ---- Theme-aware Text Colors ---- */
.text-pri      { color: var(--text-primary) !important; }
.text-body     { color: var(--text-body) !important; }
.text-muted    { color: var(--text-muted) !important; }

/* ---- Theme-aware Backgrounds ---- */
.bg-pri        { background-color: var(--bg-primary) !important; }
.bg-sec        { background-color: var(--bg-secondary) !important; }

/* ---- Theme-aware Borders ---- */
.border-light  { border-color: var(--border-light) !important; }

/* ---- Custom Shadow (Cyan glow) ---- */
.shadow-cyan   { box-shadow: var(--shadow-cyan) !important; }

/* ---- Gradients ---- */
.bg-gradient-brand { background: var(--gradient-brand) !important; }
.bg-gradient-cyan  { background: var(--gradient-cyan) !important; }

.text-gradient-brand {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.text-gradient-cyan {
    background: var(--gradient-cyan);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ---- Fonts ---- */
.font-display  { font-family: var(--font-display) !important; }
.font-body     { font-family: var(--font-body) !important; }

html {
    scroll-behavior: smooth;
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    color: var(--text-primary);
    font-weight: 700;
}

a {
    color: var(--color-cyan-mid);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-cyan-bright);
}

* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.theme-toggle-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    width: 52px;
    height: 52px;
    border: none;
    border-radius: 50%;
    background: var(--bg-primary);
    color: var(--text-primary);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease, transform 0.2s ease;
    border: 1px solid var(--border-light);
}

.theme-toggle-btn:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-cyan);
}

.theme-toggle-btn:active {
    transform: scale(0.95);
}

.theme-toggle-btn svg {
    width: 28px;
    height: 28px;
    color: currentColor;
    fill: currentColor;
    transition: color 0.3s ease;
}

/* Dark mode icon styling */
[data-theme="dark"] .theme-toggle-btn {
    background: var(--bg-secondary);
    border-color: var(--border-light);
}

/* Make the button accessible */
.theme-toggle-btn:focus-visible {
    outline: 2px solid var(--color-cyan-bright);
    outline-offset: 2px;
}

@media (max-width: 576px) {
    .theme-toggle-btn {
        bottom: 16px;
        right: 16px;
        width: 48px;
        height: 48px;
    }
    
    .theme-toggle-btn svg {
        width: 24px;
        height: 24px;
    }
}