/* ============================================
   DESIGN 25: GRADIENT TIMELINE
   CSS Variables - Design System
   Combines: Gradient Wave + Timeline + Medical
   ============================================ */

:root {
    /* ===================
       PRIMARY GRADIENTS
       =================== */
    --gradient-primary-start: #0ea5e9;
    --gradient-primary-end: #14b8a6;
    --gradient-primary: linear-gradient(135deg, var(--gradient-primary-start) 0%, var(--gradient-primary-end) 100%);
    --gradient-primary-reverse: linear-gradient(135deg, var(--gradient-primary-end) 0%, var(--gradient-primary-start) 100%);
    --gradient-primary-vertical: linear-gradient(180deg, var(--gradient-primary-start) 0%, var(--gradient-primary-end) 100%);
    --gradient-primary-diagonal: linear-gradient(45deg, var(--gradient-primary-start) 0%, var(--gradient-primary-end) 50%, var(--gradient-primary-start) 100%);

    /* Animated gradient */
    --gradient-animated: linear-gradient(
        270deg,
        var(--gradient-primary-start),
        var(--gradient-primary-end),
        #06b6d4,
        var(--gradient-primary-start)
    );

    /* ===================
       MEDICAL ACCENTS
       =================== */
    --color-mint: #a7f3d0;
    --color-mint-light: #d1fae5;
    --color-mint-dark: #6ee7b7;

    --color-lavender: #c4b5fd;
    --color-lavender-light: #ddd6fe;
    --color-lavender-dark: #a78bfa;

    --color-peach: #fed7aa;
    --color-peach-light: #ffedd5;
    --color-peach-dark: #fdba74;

    /* ===================
       SURFACE COLORS
       =================== */
    --color-surface-warm: #fffbf7;
    --color-surface-light: #ffffff;
    --color-surface-soft: #f8fafc;
    --color-surface-muted: #f1f5f9;
    --color-surface-gradient: linear-gradient(180deg, var(--color-surface-warm) 0%, var(--color-surface-light) 100%);

    /* ===================
       TEXT COLORS
       =================== */
    --color-text-primary: #1e293b;
    --color-text-secondary: #475569;
    --color-text-muted: #64748b;
    --color-text-light: #94a3b8;
    --color-text-inverse: #ffffff;

    /* Gradient text */
    --text-gradient: linear-gradient(135deg, var(--gradient-primary-start) 0%, var(--gradient-primary-end) 100%);

    /* ===================
       TIMELINE COLORS
       =================== */
    --timeline-line-color: var(--gradient-primary);
    --timeline-node-bg: var(--color-surface-light);
    --timeline-node-border: var(--gradient-primary-start);
    --timeline-node-active: var(--gradient-primary);
    --timeline-connector-width: 4px;

    /* ===================
       UI COLORS
       =================== */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    /* ===================
       SHADOWS (Medical soft)
       =================== */
    --shadow-xs: 0 1px 2px rgba(14, 165, 233, 0.05);
    --shadow-sm: 0 2px 4px rgba(14, 165, 233, 0.08);
    --shadow-md: 0 4px 12px rgba(14, 165, 233, 0.1);
    --shadow-lg: 0 8px 24px rgba(14, 165, 233, 0.12);
    --shadow-xl: 0 16px 48px rgba(14, 165, 233, 0.15);
    --shadow-2xl: 0 24px 64px rgba(14, 165, 233, 0.18);

    /* Colored shadows */
    --shadow-primary: 0 8px 24px rgba(14, 165, 233, 0.25);
    --shadow-secondary: 0 8px 24px rgba(20, 184, 166, 0.25);
    --shadow-glow: 0 0 40px rgba(14, 165, 233, 0.3);

    /* ===================
       BORDER RADIUS (Medical rounded)
       =================== */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;
    --radius-full: 9999px;

    /* ===================
       SPACING
       =================== */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --space-5xl: 8rem;

    /* ===================
       TYPOGRAPHY
       =================== */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Poppins', var(--font-primary);

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    --text-7xl: 4.5rem;

    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* ===================
       TRANSITIONS
       =================== */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    --transition-slower: 600ms ease;
    --transition-gradient: 3s ease infinite;

    /* ===================
       Z-INDEX
       =================== */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-tooltip: 600;

    /* ===================
       LAYOUT
       =================== */
    --container-max: 1280px;
    --container-narrow: 900px;
    --nav-height: 80px;
    --timeline-width: 4px;
    --timeline-node-size: 3rem;
    --timeline-node-size-lg: 4rem;

    /* ===================
       WAVE DIVIDERS
       =================== */
    --wave-height: 100px;
    --wave-height-lg: 150px;
}

/* ===================
   RESPONSIVE OVERRIDES
   =================== */
@media (max-width: 768px) {
    :root {
        --text-5xl: 2.5rem;
        --text-6xl: 3rem;
        --text-7xl: 3.5rem;
        --nav-height: 70px;
        --wave-height: 60px;
        --wave-height-lg: 80px;
        --timeline-node-size: 2.5rem;
        --timeline-node-size-lg: 3rem;
    }
}

@media (max-width: 480px) {
    :root {
        --text-4xl: 1.875rem;
        --text-5xl: 2rem;
        --text-6xl: 2.25rem;
        --space-4xl: 4rem;
        --space-5xl: 5rem;
    }
}