/* * ======================================================================================
 * HEARTIFY DESIGN SYSTEM (V5.1 - TITANIUM EDITION)
 * ARCHITECT: Senior UI/UX Engineer
 * DATE: 2026-05-21
 * UPDATES: Split Architecture - Core Layout & Editor Styles
 * ======================================================================================
 * * [TABLE OF CONTENTS]
 * --------------------------------------------------------------------------------------
 * 1.0  DESIGN TOKENS (ROOT VARIABLES)
 * 2.0  RESET & NORMALIZATION
 * 3.0  UTILITY FRAMEWORK
 * 4.0  GLOBAL LAYOUT ARCHITECTURE
 * 5.0  COMPONENT: SIDEBAR (THE COCKPIT)
 * 6.0  COMPONENT: FORM ELEMENTS
 * 7.0  COMPONENT: BUTTONS & ACTIONS
 * 8.0  COMPONENT: FEEDBACK SYSTEM
 * 9.0  MOBILE RESPONSIVENESS (VIEW SWITCHER)
 * 10.0 DARK MODE OVERRIDES (THEME: MIDNIGHT)
 * ======================================================================================
 */

/* ======================================================================================
   1.0 DESIGN TOKENS (ROOT VARIABLES)
   ====================================================================================== */
:root {
    /* --- 1.1 COLOR PALETTE: NEUTRAL (INTER UI SLATE) --- */
    --slate-025: #fcfcfd;
    --slate-050: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-400: #94a3b8;
    --slate-500: #64748b;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;
    --slate-950: #020617; /* Void Black */

    /* --- 1.1 COLOR PALETTE: BRAND (LUMINOUS ROSE) --- */
    --brand-050: #fff1f2;
    --brand-100: #ffe4e6;
    --brand-200: #fecdd3;
    --brand-300: #fda4af;
    --brand-400: #fb7185;
    --brand-500: #f43f5e; /* Main Brand Color */
    --brand-600: #e11d48;
    --brand-700: #be123c;
    --brand-800: #9f1239;
    --brand-900: #881337;
    --brand-950: #4c0519;

    /* --- 1.2 SEMANTIC ALIASES (LIGHT THEME DEFAULT) --- */
    --bg-app:      #f2f5f8; /* Complex cool grey-blue tint */
    --bg-surface:  rgba(255, 255, 255, 0.85);
    --bg-glass:    rgba(255, 255, 255, 0.65);
    --bg-panel:    #ffffff;
    --bg-input:    rgba(255, 255, 255, 0.5);

    --text-primary:   var(--slate-900);
    --text-secondary: var(--slate-600);
    --text-tertiary:  var(--slate-400);
    --text-inverse:   #ffffff;
    --text-brand:     var(--brand-600);

    --border-light:   rgba(255, 255, 255, 0.6);
    --border-base:    rgba(148, 163, 184, 0.25);
    --border-focus:   var(--brand-400);

    /* --- 1.3 ELEVATION (CINEMATIC LIGHTING) --- */
    /* Level 0: Flat */
    --shadow-none: none;
    /* Level 1: Subtle Component separation */
    --shadow-xs: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
    /* Level 2: Interactive Elements */
    --shadow-sm: 
        0 1px 3px 0 rgba(15, 23, 42, 0.08), 
        0 1px 2px -1px rgba(15, 23, 42, 0.04);
    /* Level 3: Cards & Panels */
    --shadow-md: 
        0 4px 6px -1px rgba(15, 23, 42, 0.08), 
        0 2px 4px -2px rgba(15, 23, 42, 0.04),
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
    /* Level 4: Floating Modals */
    --shadow-lg: 
        0 10px 15px -3px rgba(15, 23, 42, 0.08), 
        0 4px 6px -4px rgba(15, 23, 42, 0.04);
    /* Level 5: The Hero Artifact (Colored Shadows) - MOVED TO CARDS.CSS BUT KEPT FOR REFERENCE */
    --shadow-hero: 
        0 25px 50px -12px rgba(15, 23, 42, 0.25),
        0 0 0 1px rgba(15, 23, 42, 0.02);
    /* Special: Brand Glow */
    --glow-brand: 0 0 20px rgba(244, 63, 94, 0.35);

    /* --- 1.4 MOTION PHYSICS (SPRING CURVES) --- */
    --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275); /* Bouncy */
    --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);       /* Smooth Stop */
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);         /* Standard */
    
    --dur-fast: 200ms;
    --dur-normal: 350ms;
    --dur-slow: 600ms;

    /* --- 1.5 SPACING & LAYOUT --- */
    --header-h: 68px; /* Slightly reduced for better proportion */
    --sidebar-w: 440px;
    
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* --- 1.6 BORDERS & RADIUS --- */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1.25rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* --- FONTS --- */
    --font-sans: 'Lato', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-display: 'Montserrat', system-ui, sans-serif;
}

/* ======================================================================================
   2.0 RESET & NORMALIZATION
   ====================================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    border-width: 0;
    border-style: solid;
    border-color: var(--slate-200);
}

html {
    font-size: 15px; /* SCALED DOWN from 16px to effectively reduce overall size */
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
    -moz-tab-size: 4;
    tab-size: 4;
    scroll-behavior: smooth;
    height: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-app);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-tap-highlight-color: transparent;
    
    /* Mesh Gradient Background */
    background-image: 
        radial-gradient(at 0% 0%, rgba(225, 29, 72, 0.08) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(124, 58, 237, 0.08) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(244, 63, 94, 0.08) 0px, transparent 50%),
        radial-gradient(at 0% 100%, rgba(56, 189, 248, 0.08) 0px, transparent 50%);
    background-attachment: fixed;
    background-size: cover;
    
    /* CRITICAL: Mobile Scroll Fix */
    min-height: 100vh;
    width: 100%;
    overflow-x: hidden;
    overflow-y: auto;
}

/* Scrollbar Customization */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { 
    background: var(--slate-300); 
    border-radius: var(--radius-full); 
}
::-webkit-scrollbar-thumb:hover { background: var(--slate-400); }

/* Accessibility Focus Rings */
:focus-visible {
    outline: 2px solid var(--brand-500);
    outline-offset: 2px;
}

/* Image Resets */
img, svg, video, canvas, audio, iframe, embed, object {
    display: block;
    vertical-align: middle;
    max-width: 100%;
}

/* ======================================================================================
   3.0 UTILITY FRAMEWORK (MINI-ENGINE)
   ====================================================================================== */
/* 3.1 Layout Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.flex-1 { flex: 1 1 0%; }
.shrink-0 { flex-shrink: 0; }
.grow { flex-grow: 1; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }

.grid { display: grid; }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* 3.2 Spacing Utilities */
.p-0 { padding: 0; }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.m-0 { margin: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }

/* 3.3 Typography Utilities */
.text-xs { font-size: 0.75rem; line-height: 1rem; }
.text-sm { font-size: 0.875rem; line-height: 1.25rem; }
.text-base { font-size: 1rem; line-height: 1.5rem; }
.text-lg { font-size: 1.125rem; line-height: 1.75rem; }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }
.text-center { text-align: center; }
.uppercase { text-transform: uppercase; }
.tracking-wide { letter-spacing: 0.025em; }

/* 3.4 Color Utilities */
.text-brand { color: var(--text-brand); }
.text-mute { color: var(--text-tertiary); }
.bg-white { background-color: white; }

/* 3.5 Visibility */
.hidden { display: none !important; }
.block { display: block; }
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

/* ======================================================================================
   4.0 GLOBAL LAYOUT ARCHITECTURE
   ====================================================================================== */
.app-container {
    display: flex;
    width: 100vw;
    height: 100vh;
    overflow: hidden; /* Locked on Desktop */
    position: relative;
    isolation: isolate;
}

/* ======================================================================================
   5.0 COMPONENT: SIDEBAR (THE COCKPIT)
   ====================================================================================== */
.sidebar {
    width: var(--sidebar-w);
    height: 100%;
    background: var(--bg-glass);
    
    /* Advanced Blur Composition */
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    
    border-right: 1px solid var(--border-glass);
    display: flex;
    flex-direction: column;
    z-index: 50;
    position: relative;
    box-shadow: 
        10px 0 30px -10px rgba(0,0,0,0.05),
        inset 1px 0 0 rgba(255,255,255,0.2);
    
    /* Physics Transition */
    transition: transform var(--dur-normal) var(--ease-spring);
}

/* 5.2 Sticky Header Logic */
.sidebar-header {
    height: var(--header-h);
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255, 255, 255, 0.4);
    border-bottom: 1px solid var(--border-base);
    flex-shrink: 0;
    z-index: 20;
}

.brand-title {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--brand-600), var(--brand-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 10px rgba(225, 29, 72, 0.2);
}

/* 5.3 Scrollable Content Area */
.sidebar-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--space-6);
    padding-bottom: 6rem; /* Breathing room for footer */
    mask-image: linear-gradient(to bottom, black 95%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 95%, transparent 100%);
}

.sidebar-footer {
    padding: var(--space-6);
    background: rgba(255,255,255,0.65);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--border-base);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    z-index: 20;
}

/* ======================================================================================
   6.0 COMPONENT: FORM ELEMENTS
   ====================================================================================== */
/* 6.1 Control Groups (Floating Cards) */
.control-group {
    background: var(--bg-panel);
    border: 1px solid var(--border-base);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin-bottom: var(--space-6);
    position: relative;
    
    /* Floating Depth */
    box-shadow: var(--shadow-sm);
    transition: 
        transform 0.3s var(--ease-spring), 
        box-shadow 0.3s var(--ease-out-expo),
        border-color 0.3s ease;
}

.control-group:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--slate-300);
    z-index: 5;
}

.group-title {
    font-family: var(--font-display);
    font-size: 0.7rem; /* Keep label size minimal */
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    margin-bottom: var(--space-5);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.9;
}

/* 6.2 Liquid Inputs */
.glass-input {
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem; /* Slightly reduced padding */
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.9rem; /* Adjusted for cleaner look */
    font-weight: 500;
    line-height: 1.4;
    
    /* Inner shadow for engraved look */
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.015);
    transition: all 0.2s var(--ease-out-expo);
}

.glass-input:hover {
    background-color: var(--bg-panel);
    border-color: var(--slate-300);
}

.glass-input:focus {
    background-color: var(--bg-panel);
    border-color: var(--brand-500);
    outline: none;
    box-shadow: 
        0 0 0 3px rgba(244, 63, 94, 0.15),
        inset 0 1px 2px rgba(0,0,0,0.01);
    transform: translateY(-1px);
}

.glass-input::placeholder {
    color: var(--text-tertiary);
    font-weight: 400;
    opacity: 0.7;
}

textarea.glass-input {
    min-height: 100px;
    resize: vertical;
    line-height: 1.6;
}

/* 6.3 Labels */
label {
    display: block;
    margin-bottom: var(--space-5);
    position: relative;
}
label:last-child { margin-bottom: 0; }

.label-text {
    font-size: 0.8rem; /* Reduced label size */
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    letter-spacing: -0.01em;
}

/* AI Quote Button */
#btn-quote {
    font-size: 0.65rem;
    color: var(--brand-600);
    font-weight: 700;
    background: var(--brand-50);
    padding: 2px 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 4px;
}
#btn-quote:hover {
    background: var(--brand-100);
    transform: scale(1.05);
}

/* 6.4 Theme Picker Grid */
.theme-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

#theme-picker button {
    aspect-ratio: 1/1;
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 0 0 1px var(--slate-200), var(--shadow-sm);
    cursor: pointer;
    transition: transform 0.4s var(--ease-spring);
    position: relative;
    overflow: hidden;
}

#theme-picker button::after {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 50%;
    border: 2px solid var(--brand-500);
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.3s var(--ease-out-expo);
}

#theme-picker button:hover {
    transform: scale(1.15) rotate(5deg);
    z-index: 2;
}

#theme-picker button.active {
    transform: scale(1.1);
    box-shadow: 0 0 0 2px var(--brand-200);
}
#theme-picker button.active::after {
    opacity: 1;
    transform: scale(1);
}

/* ======================================================================================
   7.0 COMPONENT: BUTTONS & ACTIONS
   ===================================================================================== */
.btn {
    width: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: 0.85rem 1.5rem; /* Reduced vertical padding */
    border-radius: var(--radius-lg);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.9rem; /* Adjusted size */
    cursor: pointer;
    transition: all 0.3s var(--ease-spring);
    position: relative;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
}

/* 7.1 Primary (Brand Liquid) */
.btn-primary {
    background: linear-gradient(135deg, var(--brand-600) 0%, var(--brand-500) 100%);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.1);
    /* Top highlight + Brand glow */
    box-shadow: 
        0 4px 12px var(--brand-glow),
        inset 0 1px 0 rgba(255,255,255,0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 12px 24px var(--brand-glow),
        inset 0 1px 0 rgba(255,255,255,0.35);
}

.btn-primary:active {
    transform: scale(0.97);
    box-shadow: 0 2px 4px var(--brand-glow);
}

/* 7.2 Secondary (Ghost) */
.btn-secondary {
    background: var(--bg-panel);
    color: var(--text-secondary);
    border: 1px solid var(--slate-200);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--slate-050);
    color: var(--text-primary);
    border-color: var(--slate-300);
    transform: translateY(-1px);
}

/* 7.3 Icon Buttons */
.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    background: transparent;
    transition: all 0.2s var(--ease-out-expo);
    cursor: pointer;
    border: 1px solid transparent;
}
.icon-btn:hover {
    background: var(--slate-100);
    color: var(--brand-600);
    border-color: var(--slate-200);
    transform: rotate(10deg);
}

/* ======================================================================================
   8.0 COMPONENT: FEEDBACK SYSTEM
   ====================================================================================== */
#toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(40px) scale(0.9);
    background: var(--slate-900);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.01em;
    
    box-shadow: 0 15px 35px -5px rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.1);
    
    opacity: 0;
    pointer-events: none;
    transition: all 0.4s var(--ease-spring);
    z-index: 2000;
    
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
}

/* ======================================================================================
   9.0 MOBILE RESPONSIVENESS (VIEW SWITCHER)
   ====================================================================================== */

/* 9.1 View Switcher Components */
.view-switch {
    display: none; /* Desktop: Hidden */
    background: var(--slate-100);
    border: 1px solid var(--border-base);
    border-radius: var(--radius-full);
    padding: 4px;
    gap: 4px;
    margin-right: 8px;
}

.v-btn {
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all 0.3s var(--ease-spring);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1;
}

.v-btn.active {
    background: white;
    color: var(--brand-600);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    font-weight: 700;
}

/* 9.2 Mobile Logic */
@media (max-width: 1024px) {
    /* Main Layout Reset */
    .app-container {
        display: block;
        height: auto;
        min-height: 100vh;
        overflow-y: visible; /* CRITICAL: Enables native scrolling */
        padding-bottom: 2rem;
    }

    /* Sidebar Reset */
    .sidebar {
        width: 100%;
        height: auto;
        min-height: 100vh;
        border-right: none;
        box-shadow: none;
        background: transparent;
        backdrop-filter: none;
        position: static;
        transform: none;
    }

    /* Sticky Header */
    .sidebar-header {
        position: sticky;
        top: 0;
        z-index: 500;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(16px);
        box-shadow: 0 1px 0 var(--border-base), 0 4px 12px rgba(0,0,0,0.02);
    }
    
    .view-switch { display: flex; }

    /* Content Flow */
    .sidebar-content {
        padding: 1.5rem;
        overflow: visible;
        padding-bottom: 2rem;
        mask-image: none;
    }
    .control-group {
        background: rgba(255,255,255,0.9);
    }

    /* 9.3 TOGGLE LOGIC */
    
    /* EDIT MODE: Hide Preview */
    body.mode-edit .preview-stage { 
        display: none !important; 
    }

    /* PREVIEW MODE: Hide Editor */
    body.mode-preview .sidebar-content,
    body.mode-preview .sidebar-footer { 
        display: none !important; 
    }
    
    /* Collapse sidebar to just header */
    body.mode-preview .sidebar {
        min-height: 0;
    }
    
    /* Adjust Container */
    body.mode-preview .app-container {
        display: flex;
        flex-direction: column;
    }
    
    body.mode-preview .sidebar-header {
        background: rgba(255,255,255,0.85);
    }
}

/* ======================================================================================
   10.0 DARK MODE OVERRIDES (MIDNIGHT THEME)
   ====================================================================================== */
[data-theme="dark"] {
    /* --- 10.1 Color Inversion --- */
    --bg-app:      #020617;
    --bg-surface:  rgba(15, 23, 42, 0.85);
    --bg-glass:    rgba(15, 23, 42, 0.7);
    --bg-panel:    #1e293b;
    --bg-input:    rgba(30, 41, 59, 0.5);

    --border-glass: rgba(255, 255, 255, 0.08);
    --border-base:  rgba(255, 255, 255, 0.06);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    
    /* --- 10.2 Lighting Adjustments --- */
    --shadow-hero: 0 30px 60px -12px rgba(0, 0, 0, 0.8);
}

[data-theme="dark"] .sidebar-header {
    background: rgba(15, 23, 42, 0.7);
}

[data-theme="dark"] .sidebar-footer {
    background: rgba(15, 23, 42, 0.6);
}

[data-theme="dark"] .glass-input:hover,
[data-theme="dark"] .glass-input:focus {
    background-color: #1e293b;
    border-color: var(--brand-600);
}

[data-theme="dark"] .control-group {
    background: #0f172a; /* Deepest blue/black */
}

[data-theme="dark"] .view-switch {
    background: var(--slate-900);
    border-color: var(--slate-700);
}
[data-theme="dark"] .v-btn.active {
    background: var(--slate-800);
    color: var(--brand-400);
}