/* KICDA Design System - Brand Identity & Components */
/* 상용화 준비: 브랜드 일관성 100% 달성을 위한 통합 디자인 시스템 */

:root {
    /* === KICDA BRAND COLORS === */
    /* Primary Brand Colors */
    --kicda-primary: #2563eb;         /* 메인 브랜드 컬러 */
    --kicda-primary-dark: #1e40af;    /* 호버/액티브 상태 */
    --kicda-primary-light: #60a5fa;   /* 배경/보조 요소 */
    --kicda-primary-50: #eff6ff;      /* 매우 밝은 배경 */
    --kicda-primary-100: #dbeafe;     /* 밝은 배경 */
    --kicda-primary-500: #2563eb;     /* 기본 컬러 */
    --kicda-primary-600: #1d4ed8;     /* 진한 컬러 */
    --kicda-primary-700: #1e40af;     /* 더 진한 컬러 */
    --kicda-primary-800: #1e3a8a;     /* 매우 진한 컬러 */
    --kicda-primary-900: #1e3a8a;     /* 가장 진한 컬러 */

    /* Secondary Colors */
    --kicda-secondary: #06b6d4;       /* 보조 컬러 (cyan) */
    --kicda-secondary-dark: #0891b2;  /* 진한 보조 컬러 */
    --kicda-secondary-light: #22d3ee; /* 밝은 보조 컬러 */

    /* Semantic Colors */
    --kicda-success: #10b981;         /* 성공 (emerald) */
    --kicda-success-dark: #059669;    /* 진한 성공 */
    --kicda-success-light: #34d399;   /* 밝은 성공 */

    --kicda-danger: #ef4444;          /* 위험/에러 (red) */
    --kicda-danger-dark: #dc2626;     /* 진한 위험 */
    --kicda-danger-light: #f87171;    /* 밝은 위험 */

    --kicda-warning: #f59e0b;         /* 경고 (amber) */
    --kicda-warning-dark: #d97706;    /* 진한 경고 */
    --kicda-warning-light: #fbbf24;   /* 밝은 경고 */

    --kicda-info: #3b82f6;            /* 정보 (blue) */
    --kicda-info-dark: #2563eb;       /* 진한 정보 */
    /* Legacy CSS variable aliases for backward compatibility (2025-10-28) */
    --primary: var(--kicda-primary);
    --primary-dark: var(--kicda-primary-dark);
    --primary-light: var(--kicda-primary-light);
    --secondary: var(--kicda-secondary);
    --secondary-dark: var(--kicda-secondary-dark);
    --secondary-light: var(--kicda-secondary-light);
    --success: var(--kicda-success);
    --success-dark: var(--kicda-success-dark);
    --success-light: var(--kicda-success-light);
    --danger: var(--kicda-danger);
    --danger-dark: var(--kicda-danger-dark);
    --danger-light: var(--kicda-danger-light);
    --warning: var(--kicda-warning);
    --warning-dark: var(--kicda-warning-dark);
    --warning-light: var(--kicda-warning-light);
    --info: var(--kicda-info);
    --info-dark: var(--kicda-info-dark);
    --info-light: var(--kicda-info-light);
    --dark: var(--kicda-dark);
    --gray: var(--kicda-gray);
    --light-gray: var(--kicda-light-gray);
    --white: var(--kicda-white);
    --shadow: var(--kicda-shadow-md);
    --shadow-lg: var(--kicda-shadow-lg);
    --shadow-xl: var(--kicda-shadow-xl);
    --kicda-info-light: #60a5fa;      /* 밝은 정보 */

    /* Neutral Colors */
    --kicda-dark: #111827;            /* 진한 텍스트 */
    --kicda-dark-light: #374151;      /* 밝은 진한 텍스트 */
    --kicda-gray-900: #1a1a1a;        /* 매우 진한 회색 */
    --kicda-gray-700: #333333;        /* 진한 회색 */
    --kicda-gray-600: #4b5563;        /* 회색 (기존 사용) */
    --kicda-gray-500: #666666;        /* 중간 회색 */
    --kicda-gray: #6b7280;            /* 일반 텍스트 */
    --kicda-gray-light: #9ca3af;      /* 밝은 회색 텍스트 */
    --kicda-light-gray: #f3f4f6;      /* 배경 회색 */
    --kicda-light-gray-dark: #e5e7eb; /* 진한 배경 회색 */
    --kicda-white: #ffffff;           /* 화이트 */

    /* === KICDA TYPOGRAPHY === */
    /* Font Families */
    --kicda-font-primary: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --kicda-font-sans: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --kicda-font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

    /* Font Sizes */
    --kicda-text-xs: 0.75rem;         /* 12px */
    --kicda-text-sm: 0.875rem;        /* 14px */
    --kicda-text-base: 1rem;          /* 16px */
    --kicda-text-lg: 1.125rem;        /* 18px */
    --kicda-text-xl: 1.25rem;         /* 20px */
    --kicda-text-2xl: 1.5rem;         /* 24px */
    --kicda-text-3xl: 1.875rem;       /* 30px */
    --kicda-text-4xl: 2.25rem;        /* 36px */
    --kicda-text-5xl: 3rem;           /* 48px */

    /* Font Weights */
    --kicda-font-light: 300;
    --kicda-font-normal: 400;
    --kicda-font-medium: 500;
    --kicda-font-semibold: 600;
    --kicda-font-bold: 700;
    --kicda-font-extrabold: 800;
    --kicda-font-black: 900;

    /* Line Heights */
    --kicda-leading-tight: 1.25;
    --kicda-leading-normal: 1.5;
    --kicda-leading-relaxed: 1.625;
    --kicda-leading-loose: 2;

    /* Typography Scale - Mobile */
    --kicda-mobile-h1: 2rem;      /* 32px */
    --kicda-mobile-h2: 1.75rem;   /* 28px */
    --kicda-mobile-h3: 1.5rem;    /* 24px */
    --kicda-mobile-h4: 1.25rem;   /* 20px */
    --kicda-mobile-h5: 1.125rem;  /* 18px */
    --kicda-mobile-h6: 1rem;      /* 16px */

    /* === KICDA SPACING === */
    --kicda-space-1: 0.25rem;         /* 4px */
    --kicda-space-2: 0.5rem;          /* 8px */
    --kicda-space-3: 0.75rem;         /* 12px */
    --kicda-space-4: 1rem;            /* 16px */
    --kicda-space-5: 1.25rem;         /* 20px */
    --kicda-space-6: 1.5rem;          /* 24px */
    --kicda-space-8: 2rem;            /* 32px */
    --kicda-space-10: 2.5rem;         /* 40px */
    --kicda-space-12: 3rem;           /* 48px */
    --kicda-space-16: 4rem;           /* 64px */
    --kicda-space-20: 5rem;           /* 80px */
    --kicda-space-24: 6rem;           /* 96px */

    /* === KICDA SHADOWS === */
    --kicda-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --kicda-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --kicda-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --kicda-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --kicda-shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --kicda-shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

    /* === KICDA BORDER RADIUS === */
    --kicda-radius-sm: 0.125rem;      /* 2px */
    --kicda-radius: 0.25rem;          /* 4px */
    --kicda-radius-md: 0.375rem;      /* 6px */
    --kicda-radius-lg: 0.5rem;        /* 8px */
    --kicda-radius-xl: 0.75rem;       /* 12px */
    --kicda-radius-2xl: 1rem;         /* 16px */
    --kicda-radius-full: 9999px;      /* 완전한 원형 */

    /* === KICDA TRANSITIONS === */
    --kicda-transition-fast: 150ms ease-in-out;
    --kicda-transition: 200ms ease-in-out;
    --kicda-transition-slow: 300ms ease-in-out;
}

/* === KICDA COMPONENT STYLES === */

/* Reset and Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--kicda-font-primary);
    font-size: var(--kicda-text-base);
    line-height: var(--kicda-leading-normal);
    color: var(--kicda-dark);
    background-color: var(--kicda-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--kicda-font-bold);
    line-height: var(--kicda-leading-tight);
    color: var(--kicda-dark);
}

h1 { font-size: var(--kicda-text-5xl); }
h2 { font-size: var(--kicda-text-4xl); }
h3 { font-size: var(--kicda-text-3xl); }
h4 { font-size: var(--kicda-text-xl); }
h5 { font-size: var(--kicda-text-lg); }
h6 { font-size: var(--kicda-text-base); }

/* Buttons */
.kicda-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--kicda-font-primary);
    font-size: var(--kicda-text-sm);
    font-weight: var(--kicda-font-medium);
    line-height: 1;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--kicda-radius-md);
    cursor: pointer;
    transition: all var(--kicda-transition);
    user-select: none;
    white-space: nowrap;
    min-height: 44px; /* 접근성: 터치 친화적 크기 */
    padding: var(--kicda-space-3) var(--kicda-space-4);
}

.kicda-btn:focus {
    outline: 2px solid var(--kicda-primary);
    outline-offset: 2px;
}

.kicda-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Button Variants */
.kicda-btn-primary {
    background-color: var(--kicda-primary);
    color: var(--kicda-white);
    border-color: var(--kicda-primary);
}

.kicda-btn-primary:hover:not(:disabled) {
    background-color: var(--kicda-primary-dark);
    border-color: var(--kicda-primary-dark);
}

.kicda-btn-secondary {
    background-color: var(--kicda-secondary);
    color: var(--kicda-white);
    border-color: var(--kicda-secondary);
}

.kicda-btn-secondary:hover:not(:disabled) {
    background-color: var(--kicda-secondary-dark);
    border-color: var(--kicda-secondary-dark);
}

.kicda-btn-outline {
    background-color: transparent;
    color: var(--kicda-primary);
    border-color: var(--kicda-primary);
}

.kicda-btn-outline:hover:not(:disabled) {
    background-color: var(--kicda-primary);
    color: var(--kicda-white);
}

/* Button Sizes */
.kicda-btn-sm {
    font-size: var(--kicda-text-xs);
    padding: var(--kicda-space-2) var(--kicda-space-3);
    min-height: 36px;
}

.kicda-btn-lg {
    font-size: var(--kicda-text-base);
    padding: var(--kicda-space-4) var(--kicda-space-6);
    min-height: 52px;
}

/* Form Elements */
.kicda-input {
    display: block;
    width: 100%;
    font-family: var(--kicda-font-primary);
    font-size: var(--kicda-text-base);
    padding: var(--kicda-space-3) var(--kicda-space-4);
    border: 1px solid var(--kicda-light-gray-dark);
    border-radius: var(--kicda-radius-md);
    background-color: var(--kicda-white);
    transition: all var(--kicda-transition);
    min-height: 44px; /* 접근성 */
}

.kicda-input:focus {
    outline: none;
    border-color: var(--kicda-primary);
    box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

.kicda-input::placeholder {
    color: var(--kicda-gray-light);
}

/* Cards */
.kicda-card {
    background-color: var(--kicda-white);
    border-radius: var(--kicda-radius-lg);
    box-shadow: var(--kicda-shadow);
    overflow: hidden;
    transition: all var(--kicda-transition);
}

.kicda-card:hover {
    box-shadow: var(--kicda-shadow-lg);
    transform: translateY(-2px);
}

.kicda-card-header {
    padding: var(--kicda-space-6);
    border-bottom: 1px solid var(--kicda-light-gray-dark);
}

.kicda-card-body {
    padding: var(--kicda-space-6);
}

.kicda-card-footer {
    padding: var(--kicda-space-6);
    border-top: 1px solid var(--kicda-light-gray-dark);
    background-color: var(--kicda-light-gray);
}

/* === LEGACY COLOR OVERRIDES === */
/* 기존 #007bff, #667eea 등을 KICDA 브랜드 컬러로 통일 */

/* Bootstrap Legacy Overrides */
.btn-primary,
.bg-primary,
[style*="#007bff"],
[style*="#0056b3"] {
    background-color: var(--kicda-primary) !important;
    border-color: var(--kicda-primary) !important;
}

.btn-primary:hover {
    background-color: var(--kicda-primary-dark) !important;
    border-color: var(--kicda-primary-dark) !important;
}

.text-primary,
[style*="color: #007bff"],
[style*="color:#007bff"] {
    color: var(--kicda-primary) !important;
}

/* === COMPREHENSIVE LEGACY COLOR OVERRIDES === */
/* Legacy Purple/Violet Override - #667eea 전체 제거 */
[style*="#667eea"],
[style*="#764ba2"],
[class*="667eea"],
[id*="667eea"] {
    background-color: var(--kicda-primary) !important;
    color: var(--kicda-white) !important;
}

/* CSS 속성별 세부 오버라이드 */
[style*="background: #667eea"],
[style*="background-color: #667eea"],
[style*="background: linear-gradient"][style*="#667eea"] {
    background: var(--kicda-primary) !important;
    background-color: var(--kicda-primary) !important;
}

[style*="color: #667eea"],
[style*="border-color: #667eea"],
[style*="border: 1px solid #667eea"],
[style*="border-left: 4px solid #667eea"] {
    color: var(--kicda-primary) !important;
    border-color: var(--kicda-primary) !important;
}

/* 그라디언트 오버라이드 */
[style*="linear-gradient"][style*="#667eea"] {
    background: linear-gradient(135deg, var(--kicda-primary), var(--kicda-primary-light)) !important;
}

/* 버튼 및 인터랙티브 요소 */
.btn[style*="#667eea"],
button[style*="#667eea"],
a[style*="#667eea"] {
    background-color: var(--kicda-primary) !important;
    border-color: var(--kicda-primary) !important;
    color: var(--kicda-white) !important;
}

/* 호버 상태 오버라이드 */
[style*="#667eea"]:hover,
.btn[style*="#667eea"]:hover {
    background-color: var(--kicda-primary-dark) !important;
    border-color: var(--kicda-primary-dark) !important;
}

/* Border Color Overrides */
[style*="border-color: #007bff"],
[style*="border-left: 4px solid #007bff"] {
    border-color: var(--kicda-primary) !important;
}

/* Focus States */
input:focus,
textarea:focus,
select:focus {
    border-color: var(--kicda-primary) !important;
    box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1) !important;
}

/* Navigation Overrides */
.nav-logo,
.navbar .nav-logo {
    color: var(--kicda-primary) !important;
}

.nav-link:hover,
.nav-link.active {
    color: var(--kicda-primary) !important;
}

.nav-btn-primary {
    background-color: var(--kicda-primary) !important;
    border-color: var(--kicda-primary) !important;
}

.nav-btn-outline {
    /* Removed !important to allow header-improved.css to control outline button styles */
    /* Header-specific styles should be defined in header-improved.css */
}

.nav-btn-outline:hover {
    /* Removed !important to allow header-improved.css to control hover styles */
}

/* Responsive Design */
@media (max-width: 768px) {
    .kicda-btn {
        padding: var(--kicda-space-4) var(--kicda-space-5);
        min-height: 48px; /* 모바일에서 더 큰 터치 영역 */
    }

    .kicda-input {
        padding: var(--kicda-space-4);
        min-height: 48px;
    }
}

/* ====================================
   UNIFIED TYPOGRAPHY SYSTEM
   ==================================== */

/* Base Headings - Desktop First */
h1, .h1, .kicda-h1 {
    font-size: var(--kicda-text-5xl, 3rem);
    font-weight: var(--kicda-font-bold, 700);
    line-height: var(--kicda-leading-tight, 1.25);
    color: var(--kicda-gray-900);
    margin-bottom: var(--kicda-space-6, 1.5rem);
    font-family: var(--kicda-font-primary);
}

h2, .h2, .kicda-h2 {
    font-size: var(--kicda-text-4xl, 2.25rem);
    font-weight: var(--kicda-font-semibold, 600);
    line-height: var(--kicda-leading-tight, 1.25);
    color: var(--kicda-gray-900);
    margin-bottom: var(--kicda-space-5, 1.25rem);
    font-family: var(--kicda-font-primary);
}

h3, .h3, .kicda-h3 {
    font-size: var(--kicda-text-3xl, 1.875rem);
    font-weight: var(--kicda-font-semibold, 600);
    line-height: var(--kicda-leading-normal, 1.5);
    color: var(--kicda-gray-800, #2d2d2d);
    margin-bottom: var(--kicda-space-4, 1rem);
    font-family: var(--kicda-font-primary);
}

h4, .h4, .kicda-h4 {
    font-size: var(--kicda-text-2xl, 1.5rem);
    font-weight: var(--kicda-font-medium, 500);
    line-height: var(--kicda-leading-normal, 1.5);
    color: var(--kicda-gray-800, #2d2d2d);
    margin-bottom: var(--kicda-space-3, 0.75rem);
    font-family: var(--kicda-font-primary);
}

h5, .h5, .kicda-h5 {
    font-size: var(--kicda-text-xl, 1.25rem);
    font-weight: var(--kicda-font-medium, 500);
    line-height: var(--kicda-leading-normal, 1.5);
    color: var(--kicda-gray-700, #404040);
    margin-bottom: var(--kicda-space-3, 0.75rem);
    font-family: var(--kicda-font-primary);
}

h6, .h6, .kicda-h6 {
    font-size: var(--kicda-text-lg, 1.125rem);
    font-weight: var(--kicda-font-medium, 500);
    line-height: var(--kicda-leading-normal, 1.5);
    color: var(--kicda-gray-700, #404040);
    margin-bottom: var(--kicda-space-2, 0.5rem);
    font-family: var(--kicda-font-primary);
}

/* Responsive Typography - Mobile */
@media (max-width: 767px) {
    h1, .h1, .kicda-h1 {
        font-size: var(--kicda-mobile-h1, 2rem);
    }

    h2, .h2, .kicda-h2 {
        font-size: var(--kicda-mobile-h2, 1.75rem);
    }

    h3, .h3, .kicda-h3 {
        font-size: var(--kicda-mobile-h3, 1.5rem);
    }

    h4, .h4, .kicda-h4 {
        font-size: var(--kicda-mobile-h4, 1.25rem);
    }

    h5, .h5, .kicda-h5 {
        font-size: var(--kicda-mobile-h5, 1.125rem);
    }

    h6, .h6, .kicda-h6 {
        font-size: var(--kicda-mobile-h6, 1rem);
    }
}

/* Special Heading Classes */
.placeholder-title {
    font-size: var(--kicda-text-5xl, 3rem);
    font-weight: var(--kicda-font-bold, 700);
    line-height: var(--kicda-leading-tight, 1.25);
    color: var(--kicda-gray-900);
}

/* Ensure consistency across all possible heading contexts */
.hero h1, .banner h1, .page-title {
    font-size: var(--kicda-text-5xl, 3rem);
    font-weight: var(--kicda-font-bold, 700);
}

/* Section titles should respect heading hierarchy */
h1.section-title {
    font-size: var(--kicda-text-5xl, 3rem);
    font-weight: var(--kicda-font-bold, 700);
}

h2.section-title {
    font-size: var(--kicda-text-4xl, 2.25rem);
    font-weight: var(--kicda-font-bold, 700);
}

h3.section-title {
    font-size: var(--kicda-text-3xl, 1.875rem);
    font-weight: var(--kicda-font-bold, 700);
}

@media (max-width: 767px) {
    .hero h1, .banner h1, .page-title,
    .placeholder-title {
        font-size: var(--kicda-mobile-h1, 2rem);
    }

    h1.section-title {
        font-size: var(--kicda-mobile-h1, 2rem);
    }

    h2.section-title {
        font-size: var(--kicda-mobile-h2, 1.75rem);
    }

    h3.section-title {
        font-size: var(--kicda-mobile-h3, 1.5rem);
    }
}

/* Specific title class overrides to ensure proper hierarchy */
h1.placeholder-title {
    font-size: var(--kicda-text-5xl, 3rem);
    font-weight: var(--kicda-font-bold, 700);
}

h2.cta-title {
    font-size: var(--kicda-text-4xl, 2.25rem);
    font-weight: var(--kicda-font-bold, 700);
}

h3.category-title,
h3.course-title,
h3.feature-title {
    font-size: var(--kicda-text-3xl, 1.875rem);
    font-weight: var(--kicda-font-bold, 700);
}

/* Modal and footer overrides */
.modal-header h2 {
    font-size: var(--kicda-text-4xl, 2.25rem);
    font-weight: var(--kicda-font-bold, 700);
}

.footer-section h3,
.modal-body h3 {
    font-size: var(--kicda-text-3xl, 1.875rem);
    font-weight: var(--kicda-font-bold, 700);
}

@media (max-width: 767px) {
    h1.placeholder-title {
        font-size: var(--kicda-mobile-h1, 2rem);
    }

    h2.cta-title {
        font-size: var(--kicda-mobile-h2, 1.75rem);
    }

    h3.category-title,
    h3.course-title,
    h3.feature-title {
        font-size: var(--kicda-mobile-h3, 1.5rem);
    }

    .modal-header h2 {
        font-size: var(--kicda-mobile-h2, 1.75rem);
    }

    .footer-section h3,
    .modal-body h3 {
        font-size: var(--kicda-mobile-h3, 1.5rem);
    }
}