/* ============================================
   KADOHR - MAIN STYLESHEET
   Design System & Foundation
   ============================================ */

/* ---------- 1. CSS CUSTOM PROPERTIES ---------- */
:root {
    /* Brand Colors */
    --kd-primary: #FF4B6E;
    --kd-primary-light: #FF6B8A;
    --kd-primary-dark: #E8355A;
    --kd-primary-gradient: linear-gradient(135deg, #FF4B6E 0%, #FF8E53 100%);
    
    --kd-secondary: #6B5CE7;
    --kd-secondary-light: #8B7FF0;
    
    /* Semantic Colors */
    --kd-success: #10B981;
    --kd-warning: #F59E0B;
    --kd-error: #EF4444;
    --kd-info: #3B82F6;
    
    /* Neutral Colors */
    --kd-bg: #FAFAFA;
    --kd-surface: #FFFFFF;
    --kd-surface-elevated: #FFFFFF;
    --kd-border: #E5E7EB;
    --kd-border-light: #F3F4F6;
    
    /* Text Colors */
    --kd-text: #1A1A2E;
    --kd-text-secondary: #6B7280;
    --kd-text-muted: #9CA3AF;
    --kd-text-inverse: #FFFFFF;
    
    /* Shadows */
    --kd-shadow-xs: 0 1px 2px rgba(26, 26, 46, 0.04);
    --kd-shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
    --kd-shadow-md: 0 4px 16px rgba(26, 26, 46, 0.08);
    --kd-shadow-lg: 0 8px 32px rgba(26, 26, 46, 0.12);
    --kd-shadow-xl: 0 16px 48px rgba(26, 26, 46, 0.16);
    --kd-shadow-glow: 0 0 20px rgba(255, 75, 110, 0.3);
    
    /* Border Radius */
    --kd-radius-sm: 8px;
    --kd-radius-md: 12px;
    --kd-radius-lg: 20px;
    --kd-radius-xl: 28px;
    --kd-radius-full: 9999px;
    
    /* Spacing Scale */
    --kd-space-1: 4px;
    --kd-space-2: 8px;
    --kd-space-3: 12px;
    --kd-space-4: 16px;
    --kd-space-5: 20px;
    --kd-space-6: 24px;
    --kd-space-8: 32px;
    --kd-space-10: 40px;
    --kd-space-12: 48px;
    --kd-space-16: 64px;
    
    /* Typography */
    --kd-font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --kd-font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    --kd-text-xs: 0.75rem;
    --kd-text-sm: 0.875rem;
    --kd-text-base: 1rem;
    --kd-text-lg: 1.125rem;
    --kd-text-xl: 1.25rem;
    --kd-text-2xl: 1.5rem;
    --kd-text-3xl: 1.875rem;
    --kd-text-4xl: 2.25rem;
    
    /* Transitions */
    --kd-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --kd-transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --kd-transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --kd-transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* Z-Index Scale */
    --kd-z-base: 1;
    --kd-z-dropdown: 100;
    --kd-z-sticky: 200;
    --kd-nav: 300;
    --kd-z-modal-backdrop: 400;
    --kd-z-modal: 500;
    --kd-z-toast: 600;
    --kd-z-loader: 700;
    
    /* Layout */
    --kd-nav-height-mobile: 64px;
    --kd-nav-height-desktop: 72px;
    --kd-content-max-width: 1200px;
    --kd-card-max-width: 420px;
}

/* ---------- 2. RESET & BASE ---------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--kd-font-body);
    font-size: var(--kd-text-base);
    line-height: 1.6;
    color: var(--kd-text);
    background-color: var(--kd-bg);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

/* Mobile safe area support */
@supports (padding: max(0px)) {
    body {
        padding-bottom: max(var(--kd-space-4), env(safe-area-inset-bottom));
    }
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--kd-font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--kd-text);
}

a {
    color: inherit;
    text-decoration: none;
}

img, svg, video {
    display: block;
    max-width: 100%;
    height: auto;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    -webkit-appearance: none;
    appearance: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
}

/* ---------- 3. UTILITIES ---------- */
.hidden { display: none !important; }
.invisible { visibility: hidden; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-2 { gap: var(--kd-space-2); }
.gap-3 { gap: var(--kd-space-3); }
.gap-4 { gap: var(--kd-space-4); }
.w-full { width: 100%; }
.h-full { height: 100%; }
.text-center { text-align: center; }
.text-gradient {
    background: var(--kd-primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ---------- 4. LAYOUT ---------- */
.main-content {
    width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    padding-top: var(--kd-space-4);
    padding-bottom: calc(var(--kd-nav-height-mobile) + var(--kd-space-6));
    padding-left: var(--kd-space-4);
    padding-right: var(--kd-space-4);
}

@media (min-width: 1024px) {
    .main-content {
        padding-top: calc(var(--kd-nav-height-desktop) + var(--kd-space-6));
        padding-bottom: var(--kd-space-8);
        padding-left: var(--kd-space-8);
        padding-right: var(--kd-space-8);
        max-width: var(--kd-content-max-width);
        margin: 0 auto;
    }
}

/* ---------- 5. GLOBAL LOADER ---------- */
.global-loader {
    position: fixed;
    inset: 0;
    z-index: var(--kd-z-loader);
    background: var(--kd-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: var(--kd-space-4);
    transition: opacity var(--kd-transition-slow), visibility var(--kd-transition-slow);
}

.global-loader:not(.active) {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader-pulse {
    position: relative;
    width: 80px;
    height: 80px;
}

.loader-pulse::before {
    content: '';
    position: absolute;
    inset: -8px;
    border-radius: var(--kd-radius-full);
    background: var(--kd-primary-gradient);
    opacity: 0.15;
    animation: loader-pulse-ring 2s ease-out infinite;
}

.loader-logo {
    position: relative;
    width: 80px;
    height: 80px;
    border-radius: var(--kd-radius-full);
    background: var(--kd-primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--kd-font-heading);
    font-size: var(--kd-text-3xl);
    font-weight: 800;
    color: var(--kd-text-inverse);
    box-shadow: var(--kd-shadow-glow);
    animation: loader-breathe 2s ease-in-out infinite;
}

.loader-text {
    font-size: var(--kd-text-sm);
    font-weight: 500;
    color: var(--kd-text-secondary);
    letter-spacing: 0.05em;
}

/* ---------- 6. NAVIGATION ---------- */
.main-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: var(--kd-nav);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-top: 1px solid var(--kd-border-light);
    transition: transform var(--kd-transition-base);
}

.main-nav.hidden {
    transform: translateY(100%);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--kd-nav-height-mobile);
    padding: 0 var(--kd-space-4);
    max-width: var(--kd-content-max-width);
    margin: 0 auto;
}

.nav-brand { display: none; }

.nav-links {
    display: flex;
    align-items: center;
    justify-content: space-around;
    width: 100%;
    gap: var(--kd-space-2);
}

.nav-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: var(--kd-space-2) var(--kd-space-3);
    border-radius: var(--kd-radius-md);
    transition: var(--kd-transition-fast);
    position: relative;
    min-width: 56px;
}

.nav-link:hover { background: var(--kd-border-light); }
.nav-link.active { color: var(--kd-primary); }

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--kd-primary-gradient);
    border-radius: 2px;
}

.nav-icon {
    font-size: 1.25rem;
    line-height: 1;
    transition: transform var(--kd-transition-bounce);
}

.nav-link:hover .nav-icon { transform: scale(1.15); }

.nav-label {
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.nav-badge {
    position: absolute;
    top: 2px;
    right: 4px;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    background: var(--kd-primary);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    border-radius: var(--kd-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(255, 75, 110, 0.3);
}

.nav-actions { display: none; }

/* Desktop Navigation */
@media (min-width: 1024px) {
    .main-nav {
        top: 0;
        bottom: auto;
        border-top: none;
        border-bottom: 1px solid var(--kd-border-light);
    }
    .main-nav.hidden { transform: translateY(-100%); }
    
    .nav-container {
        height: var(--kd-nav-height-desktop);
        padding: 0 var(--kd-space-8);
    }
    
    .nav-brand {
        display: flex;
        align-items: center;
    }
    
    .brand-link {
        display: flex;
        align-items: center;
        gap: var(--kd-space-3);
        font-family: var(--kd-font-heading);
        font-size: var(--kd-text-xl);
        font-weight: 700;
        color: var(--kd-text);
    }
    
    .brand-icon {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 36px;
        background: var(--kd-primary-gradient);
        border-radius: var(--kd-radius-md);
        color: white;
    }
    
    .brand-icon svg { width: 18px; height: 18px; }
    
    .nav-links {
        width: auto;
        gap: var(--kd-space-2);
    }
    
    .nav-link {
        flex-direction: row;
        gap: var(--kd-space-2);
        padding: var(--kd-space-2) var(--kd-space-4);
    }
    
    .nav-link.active::after { display: none; }
    .nav-label { font-size: var(--kd-text-sm); }
    
    .nav-actions {
        display: flex;
        align-items: center;
        gap: var(--kd-space-2);
    }
    
    .btn-nav-icon {
        width: 40px;
        height: 40px;
        border-radius: var(--kd-radius-full);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.1rem;
        transition: var(--kd-transition-fast);
        color: var(--kd-text-secondary);
    }
    
    .btn-nav-icon:hover {
        background: var(--kd-border-light);
        color: var(--kd-text);
    }
    
    .btn-nav-icon:active { transform: scale(0.92); }
}

/* ---------- 7. AUTH OVERLAY ---------- */
.auth-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--kd-z-modal);
    background: rgba(250, 250, 250, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--kd-space-6);
    transition: opacity var(--kd-transition-slow), visibility var(--kd-transition-slow);
}

.auth-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* ---------- 8. TOAST NOTIFICATIONS ---------- */
.toast-container {
    position: fixed;
    top: var(--kd-space-4);
    right: var(--kd-space-4);
    z-index: var(--kd-z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--kd-space-3);
    pointer-events: none;
    max-width: 400px;
    width: calc(100% - var(--kd-space-8));
}

.toast {
    pointer-events: all;
    background: var(--kd-surface);
    border-radius: var(--kd-radius-lg);
    padding: var(--kd-space-4) var(--kd-space-5);
    box-shadow: var(--kd-shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--kd-space-3);
    transform: translateX(120%);
    animation: toast-slide-in var(--kd-transition-bounce) forwards;
    border-left: 4px solid var(--kd-primary);
    position: relative;
    overflow: hidden;
}

.toast.success { border-left-color: var(--kd-success); }
.toast.error { border-left-color: var(--kd-error); }
.toast.warning { border-left-color: var(--kd-warning); }
.toast.info { border-left-color: var(--kd-info); }

.toast.removing { animation: toast-slide-out var(--kd-transition-base) forwards; }

.toast-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: var(--kd-primary);
    border-radius: 0 2px 2px 0;
    animation: toast-progress 4s linear forwards;
}

.toast.success .toast-progress { background: var(--kd-success); }
.toast.error .toast-progress { background: var(--kd-error); }
.toast.warning .toast-progress { background: var(--kd-warning); }
.toast.info .toast-progress { background: var(--kd-info); }

/* ---------- 9. MODAL SYSTEM ---------- */
.modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: var(--kd-z-modal-backdrop);
    background: rgba(26, 26, 46, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    transition: opacity var(--kd-transition-base);
}

.modal-backdrop.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    z-index: var(--kd-z-modal);
    width: 90%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    background: var(--kd-surface);
    border-radius: var(--kd-radius-xl);
    box-shadow: var(--kd-shadow-xl);
    opacity: 0;
    pointer-events: none;
    transition: var(--kd-transition-base);
}

.modal-container.active {
    opacity: 1;
    pointer-events: all;
    transform: translate(-50%, -50%) scale(1);
}

/* Mobile bottom sheet style */
@media (max-width: 640px) {
    .modal-container {
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        transform: translateY(100%);
        width: 100%;
        max-width: 100%;
        border-radius: var(--kd-radius-xl) var(--kd-radius-xl) 0 0;
        max-height: 85vh;
    }
    
    .modal-container.active { transform: translateY(0); }
}

/* ---------- 10. FLOATING ACTION BUTTONS ---------- */
.fab-container {
    position: fixed;
    bottom: calc(var(--kd-nav-height-mobile) + var(--kd-space-4));
    right: var(--kd-space-4);
    z-index: var(--kd-z-sticky);
    display: flex;
    flex-direction: column;
    gap: var(--kd-space-3);
    pointer-events: none;
}

.fab-container > * { pointer-events: all; }

@media (min-width: 1024px) {
    .fab-container {
        bottom: var(--kd-space-6);
        right: var(--kd-space-8);
    }
}

/* ---------- 11. SCROLLBAR & SELECTION ---------- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--kd-border);
    border-radius: var(--kd-radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--kd-text-muted); }

::selection {
    background: rgba(255, 75, 110, 0.2);
    color: var(--kd-text);
}

/* ---------- 12. ANIMATIONS ---------- */
@keyframes loader-pulse-ring {
    0% { transform: scale(1); opacity: 0.3; }
    100% { transform: scale(1.6); opacity: 0; }
}

@keyframes loader-breathe {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes toast-slide-in { to { transform: translateX(0); } }
@keyframes toast-slide-out { to { transform: translateX(120%); opacity: 0; } }
@keyframes toast-progress { from { width: 100%; } to { width: 0%; } }

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes fade-in-up {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes scale-in {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

/* ---------- 13. ERROR PAGE ---------- */
.error-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    text-align: center;
    gap: var(--kd-space-4);
    animation: fade-in-up var(--kd-transition-slow);
}

.error-code {
    font-family: var(--kd-font-heading);
    font-size: clamp(4rem, 15vw, 8rem);
    font-weight: 800;
    line-height: 1;
    background: var(--kd-primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.8;
}

.error-page h1 { font-size: var(--kd-text-2xl); color: var(--kd-text); }
.error-page p { color: var(--kd-text-secondary); max-width: 400px; }

/* ---------- 14. RESPONSIVE UTILITIES ---------- */
@media (min-width: 640px) { .sm\:hidden { display: none !important; } }
@media (min-width: 768px) { .md\:hidden { display: none !important; } }
@media (min-width: 1024px) { .lg\:hidden { display: none !important; } }